I have create a rebar control and a toolbar. The toolbar is a child window of rebar control.

I have just created and gotten the hwnd of the rebar control that creates the toolbar and sets toolbar as its child window itself. So I am unable to get the hwnd of the toolbar.
I want to change the state of the buttons on the toolbar at runtime. Do you know how to get the hwnd of toolbar if I have the hwnd of the rebar control?