// Edit file JoinExample.php

// 1. disable edit inplace. 

// 2. remove edit icon 
$this->Editor->setConfig('removeIcons','E');

// 3. Add button for editing multiple rows in new window.
$userButtons[] = array( 'button_html' => '<button onclick="'.$this->mateInstances[0].'.editRows();">Edit Multiple New Window</button>');