Dialog Box in SDI

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VC8.0

C++

Hi,

I have created an mfc sdi application. I have also included a dialog box in my sdi through menu bar. Now I have a check box in my dialog and an ellipse filled with red color in sdi. Now my requirement is to change the color on the check box click. I've done everything. But how can I tell the check box click to OnDraw, means how to pass the value to OnDraw. Please give me some ideas?????..

Thanks in advance.