How to force any application's window to redraw

I am looking for a way to force any window (even the ones where I am not the owner) to redraw. It has to work for all window (cocoa, carbon , ...)

Do you have any pointer to achieve this?开发者_StackOverflow中文版

Thanks in advance for your help,

Regards,

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You must set this property in the initWithWindow method [self setShouldCascadeWindows:NO]; ,here the self refers to the window that is being initiated.