In my scenario I want to add child nodes when any one expend the node or press the plus sign. But the Node expend event is not rising and can I call a java script function (radalert message on a condition) on context menu click event?
To fire the NodeExpand event in the code behind make sure that you have set the node ExpandMode property to ServerSide as shown below. Also refer the following code to dispaly an alert on clicking an item in the ContextMenu.
aspx: