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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * Provides the entry point to editing a single record presented by the  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * {@link GridField}. | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * Doesn't show an edit view on its own or modifies the record, but rather  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * relies on routing conventions established in {@link getColumnContent()}. | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * The default routing applies to the {@link GridFieldDetailForm} component, | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * which has to be added separately to the {@link GridField} configuration. | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class GridFieldAddNewButtonOriginalPageSecondHandProduct extends GridFieldAddNewButtonOriginalPage  | 
            
                            
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                { | 
            
            
                                                                        
                            
            
                                    
            
            
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                    public function getHTMLFragments($gridField)  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    { | 
            
            
                                                                        
                            
            
                                    
            
            
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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_USING_PAGES_SECTION', 'Add {name}', array('name' => $objectName)); | 
            
                            
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                        }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        $getSegment = '';  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        if ($page = $this->BestRootParentPage()) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                            $getSegment = '?ParentID='.$page->ID;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        $data = new ArrayData(array(  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            'NewLink' => '/admin/'.Config::inst()->get('CMSPageAddController_SecondHandProducts', 'url_segment').'/'.$getSegment, | 
            
            
                                                                        
                            
            
                                    
            
            
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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('GridFieldAddNewbutton'), | 
            
            
                                                                        
                            
            
                                    
            
            
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                        );  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * finds the most likely root parent for the shop.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return SiteTree | NULL  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function BestRootParentPage()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $singleton = Injector::inst()->get('SecondHandProductGroup'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $singleton->BestRootParentPage();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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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.