copygridfieldfunction.php

<?php

public function getEditForm($id = null, $fields = null) {
		$form = parent::getEditForm($id, $fields);
		// $gridFieldName is generated from the ModelClass, eg if the Class 'Product'
		// is managed by this ModelAdmin, the GridField for it will also be named 'Product'
		$gridFieldName = $this->sanitiseClassName($this->modelClass);
		if($gridFieldName=='Speaker'){
			$gridField = $form->Fields()->fieldByName($gridFieldName);
			$gridField->getConfig()->addComponent(new GridFieldOrderableRows());
		}
        $form
            ->Fields()
            ->fieldByName($this->sanitiseClassName($this->modelClass))
            ->getConfig()
            ->removeComponentsByType('GridFieldEditButton')
            ->removeComponentsByType('GridFieldDeleteAction')
            ->removeComponentsByType('GridFieldDetailForm')
            ->addComponent(new GridFieldDetailFormCustom())
            ->addComponent(new GridFieldCopyButton())
            ->addComponent(new GridFieldEditButton())
            ->addComponent(new GridFieldDeleteAction())
        ;
		return $form;
	}