How to Unhook two hook procedures simultaneously?

In my application I created two procedures namely callbackwnd proc开发者_开发百科edure to handle focus events and mouse procedure to handle mouse click events.when I unhook the two procedure the application will flicker little bit.how to overcome this?

I also like to know which procedure is first to use unhook function ?

Regards, Karthik

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You can unhook any procedure at any time.preferably unhook the procedure while closing the window(WM_CLOSE).

The flickering may happened due to unhooking the function twice.