Hello Sanjay,
If you want to show/hide a RadDock, you should use the
Closed property. In case that you want to show/hide it on the client you should use dock.set_closed(true/false) method. I tested the code below(which is similar to described goal) and everything works as expected:
Codebehind:
In case the issue perisists on your side, please share reproduction code which is fully runnable and we will do our best to help.
Greetings,
Petio Petkov
the Telerik team