Parent Node Icon of Tree Panel (Tree Grid) in Extjs - Extended Javascript Library

Did you ever face an issue with the parent record icon in Tree Panel. Have you observed that double clicking on the Parent node icon - changes it to child record icon.
Huh, here is one of the solutions for resolving such issue.

listeners:{
    // AVOID ICON TO CHANGE ON DOUBLE CLICK
    beforeitemexpand : function(node,eOpts ){
        if(!node.isExpandable()){
            return false;
        }
    }
}