diff --git a/modules/base.js b/modules/base.js
index 0f50f59b..c8f222c1 100644
--- a/modules/base.js
+++ b/modules/base.js
@@ -514,6 +514,7 @@ var TreeStyleTabBase = inherit(TreeStyleTabConstants, {
  
 	isEventFiredOnTwisty : function TSTBase_isEventFiredOnTwisty(aEvent) 
 	{
+		return false;
 		var tab = this.getTabFromEvent(aEvent);
 		if (!tab ||
 			!this.hasChildTabs(tab) ||