I have two RadTreeView controls on a page and on RadTreeView1_NodeExpand I want to bind RadTreeView2 with some other data based on RadTreeView1 current node data. Even though the function to load RadTreeView2 is called, RadTreeView2 is not displayed. if I call the same function on RadTreeView1_NodeClick event then it is visible. How to make it visible on NodeExpand event? You help is much appreciated.