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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class DMSGridFieldAddNewButton extends GridFieldAddNewButton implements GridField_HTMLProvider  | 
            
                            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * The document set ID that the document should be attached to  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @var int  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected $documentSetId;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Overriding the parent method to change the template that the DMS add button will be rendered with  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param  GridField $gridField  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return array  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                     */  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    public function getHTMLFragments($gridField)  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        $singleton = singleton($gridField->getModelClass());  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        if (!$singleton->canCreate()) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                            return array();  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        if (!$this->buttonName) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                            // provide a default button name, can be changed by calling {@link setButtonName()} on this component | 
            
            
                                                                        
                            
            
                                    
            
            
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                            $objectName = $singleton->i18n_singular_name();  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            $this->buttonName = _t('GridField.Add', 'Add {name}', array('name' => $objectName)); | 
            
                            
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                        }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        $link = singleton('DMSDocumentAddController')->Link(); | 
            
            
                                                                        
                            
            
                                    
            
            
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                        if ($this->getDocumentSetId()) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                            $link = Controller::join_links($link, '?dsid=' . $this->getDocumentSetId());  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            // Look for an associated page, but only share it if we're editing in a page context  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            $set = DMSDocumentSet::get()->byId($this->getDocumentSetId());  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            if ($set && $set->exists() && $set->Page()->exists()  | 
            
            
                                                                        
                            
            
                                    
            
            
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                                && Controller::curr() instanceof CMSPageEditController  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            ) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                                $link = Controller::join_links($link, '?page_id=' . $set->Page()->ID);  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        $data = new ArrayData(array(  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            'NewLink' => $link,  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            'ButtonName' => $this->buttonName,  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        ));  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        return array(  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            $this->targetFragment => $data->renderWith('DMSGridFieldAddNewButton'), | 
            
            
                                                                        
                            
            
                                    
            
            
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                        );  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Set the document set ID that this document should be attached to  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param  int $id  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return $this  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function setDocumentSetId($id)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->documentSetId = $id;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $this;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Get the document set ID that this document should be attached to  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return int  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function getDocumentSetId()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $this->documentSetId;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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You can fix this by adding a namespace to your class:
When choosing a vendor namespace, try to pick something that is not too generic to avoid conflicts with other libraries.