Repaint issue with opengl

i am using Nvidia quadro 2000 and latest driver. In my application i have two windows say winA and winB which uses opengl in the winA i have a child opengl window when i close it,part of tht window stays on screen.
However when i close the winA and then close the child window of winA,problem doesnt occur.
with graphics card other than 2000 also the problem doesnt occur.

Please tell me the cause of this

Thanks in advance

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