Untitled

Owner-drawn button with BS_AUTORADIOBUTTON style
void CPngButton::DrawItem( LPDRAWITEMSTRUCT lpDIS )
{
    ASSERT(lpDIS != NULL);

    UINT state = lpDIS->itemState;
    if (state & ODS_CHECKED)
    {
    // do stuff
    }
}

if (BST_CHECKED == SendMessage(BM_GETCHECK))

if (Button_GetState(lpDIS->hwndItem) & BST_CHECKED)

CButton myBtn;
if (myBtn.GetCheck() = BST_CHECKED)
{
    // Drawing code here...
}