/**
 * @class Ext.tree.SpecialTreeNodeUI
 * This class provides a special UI implementation for trees, which DO NOT
 * toggle their state on double-clicks.
 */
Ext.tree.NoDoubleclickExpandTreeNodeUI = Ext.extend(Ext.tree.TreeNodeUI, {
    // private
    onDblClick : function(e){
        e.preventDefault();
        if(this.disabled){
            return;
        }
        if(this.checkbox){
            this.toggleCheck();
        }
        this.fireEvent("dblclick", this.node, e);
    }
});