Is CBitmapButton the right tool for a push like checkbox?

I'm creating a custom window in WTL to hold video controls for a DirectShow app.  I'm first prototyping the window using a dialog.

I've created a set of check boxes that I wish to behave in the "push like" manner (BS_PUSHLIKE).  They appear defined in the .rc file for the dialog like so:

    CONTROL         "",IDC_VID1,"Button",BS_AUTOCHECKBOX | BS_BITMAP | BS_PUSHLIKE | WS_GROUP | WS_TABSTOP,6,7,19,18

I've also loaded an image list for the button, which correctly shows the appropriate image when the button is in mouse button down and up states.

In the code below, m_btnVid1 is defined as a CBitmapButton:

    m_ilBtnVid1.CreateFromImage( IDB_TV, 25, 1, CLR_NONE, IMAGE_BITMAP, LR_CREATEDIBSECTION );
    m_btnVid1.SubclassWindow( (HWND) ::GetDlgItem(m_hWnd, IDC_VID1) );
    m_btnVid1.SetImageList( m_ilBtnVid1.m_hImageList );
    m_btnVid1.SetImages(0,1);



When clicking on this button, as soon as I release the mouse button, the checkboxes state reverts to "unchecked" state.

I've added a COMMAND_ID_HANDLER_EX to the IDC_VID1 control to determine the state of the control, but the nState variable always reads 0, even after I've explicitly set the check in code:

    void OnVid1(UINT uNotifyCode, int nID, CWindow wndCtl)
	{		
		CBitmapButton* btn = &m_btnVid1;
		int	nState = btn->GetCheck();		

		switch( nState )
		{
			case BST_UNCHECKED:
				btn->SetCheck( BST_CHECKED );
				nState = btn->GetCheck();
				break;

			default:
				btn->SetCheck( BST_UNCHECKED );
				break;
		}
	}

Can anyone suggest why this might be - am I missing a creation style in the CBitmapButton?

If it helps, I'm sure I can post the VC2008 solution file online somehow.



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