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TGIF.

I add some radio button on a dialog and check its style as "Push-like".
After defining the variable for the control as CExtRadioButton, push-like style is gone.
Did I something wrong?

You need simply to subclass the radio button with the CExtButton class.

If I subclass the option button with the CExtButton class, original behavior of option button is not called.
You know, three option button, first button’s style is group, then, only one option button is remain checked.

We confirm that there is a bug in the CExtCheckBox and CExtRadioButton classes with this regard. Please add the following code at the beginning of the CExtRadioButton::_RenderImpl() and CExtCheckBox::_RenderImpl() virtual methods:

if( (GetStyle()&BS_PUSHLIKE) != 0 )
{
   CExtButton::_RenderImpl(
      dc,
      bTransparent,
      bCombinedContent
      );
   return;
}

This will fix the problem.