Tree panel error in extjs4
<p>In ExtJS4, a tree panel was created with Ext.tree.Panel. When it is clicked multiple times (around 8 to 16) to expand or collapse the tree nodes, It gives error 'event' is null or not an object at line 10708 of ext-all-debug.js. On each click it creats another node below the clicked one. This problem is seen only in IE 8 where as same code are working fine in FirFox. Can anyone fix this issue please?</p>
