Detect mouse click in mfc/ole

Hi!

I am trying to implement a mouse click using mfc in an existent software. The
client is a mfc application that is connected to a server through OLE
automation. The client display the video recorded with a server that is connect to through
OLE. I used the wizared to implement the detection of the mouse click by the
client:

void CChildView::OnLButtonDown(UINT nFlags, CPoint point)
    {
        CDC* pDC1 = GetDC();
        pDC1->SelectStockObject(WHITE_BRUSH);
        pDC1->Ellipse(0,0,20,20);
    }

I was expecting that when I click, a small circle will appear. But it doesn't work, I can see only the video displayed. This code is not called when I click, I checked with break points ... When I implement this in a simple independent project, it works. I would appreciate your help to solve this.
Thanks! L.