Treeview Click event?

You can hide it with something like this (you will need to change the GUID):

EpiTreeViewPanel tvp = (EpiTreeViewPanel)(csm.GetNativeControlReference("8f08953f-b49f-4fb5-ba14-3c5102fd6b0c"));
tvp.Visible = false;
//tvp = null;

Also, look here for treeview functionality: