how to call Onpaint only when dialog is receiving user inputs?

[coda_x]

i have a main dialog containing 3 child dialogs. I created a COpenglclass in main dialog such that any image visualization will take place in the main dialog. But i do not know how to detect that if any child dialogs are accessed only then will my drawing code in the COpengl class take in data from the child dialog and show the relevant image. need help on this urgently

[Stan the man]

Is it possible just to use the child's msg when it receives focus or something along those lines and then react and do whatever you want.

[coda_x]

thanx for replying. i am considering alternative or setting state flags but i not sure how to code that in child dialog and view class's Onpaint().can you illustrate?