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Having a problem in MFC

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Hello,
I'm having a problem getting some code to run properly here, The basis is I have an ellipse, I need to have it so when you left click it, it changes color. I have the OnLButtonDown handler set up but I'm not getting any results. Any one think they could take a look? here is the handler code:

[CODE]
void CAssignment3Dlg::OnLButtonDown(UINT nFlags, CPoint point)
{

CClientDC dc(this);
CRect rect;
GetClientRect(&rect);
dc.SetMapMode(MM_ANISOTROPIC);
dc.SetWindowExt(100,100);
dc.SetViewportExt(rect.Width(),rect.Height());

CRect ellBound(ellLeft,ellSize);
CRgn ellCircle;
dc.LPtoDP(ellBound);
ellCircle.CreateEllipticRgnIndirect(ellBound);
if(ellCircle.PtInRegion(point))
{
if(!mCapture)
{
SetCapture();
mCapture = true;
}
EllipseCl = RGB(0,0,255);
CBrush bEll(HS_CROSS, EllipseCl);
dc.SelectObject(bEll);
InvalidateRect(ellBound,FALSE);
}

CDialogEx::OnLButtonDown(nFlags, point);
}
[/CODE]

ellLeft is a pont set the the top left of the ellipse rect, and ellSize is a CSize set to the width and height.

here is my on paint function if you need:

[CODE]
void CAssignment3Dlg::OnPaint()
{
CPaintDC dc(this);
CRect rect;
GetClientRect(&rect);

dc.SetMapMode(MM_ANISOTROPIC);
dc.SetWindowExt(100,100);
dc.SetViewportExt(rect.Width (), rect.Height ());
CPen Pen(PS_DASH,1,RGB(0,0,0));
dc.SelectObject(Pen);
dc.Rectangle(80,40,90,55);
CBrush bBrush(RGB(0,0,0));
dc.SelectObject(bBrush);
dc.Rectangle(45,20,60,80);
CBrush rCrossBrush(HS_CROSS, RGB(255,0,0));
dc.SelectObject(rCrossBrush);
dc.Ellipse(10,10,20,20);
if (IsIconic())
{
CPaintDC dc(this); // device context for painting
SendMessage(WM_ICONERASEBKGND, reinterpret_cast<WPARAM>(dc.GetSafeHdc()), 0);
// Center icon in client rectangle
int cxIcon = GetSystemMetrics(SM_CXICON);
int cyIcon = GetSystemMetrics(SM_CYICON);
CRect rect;
GetClientRect(&rect);
int x = (rect.Width() - cxIcon + 1) / 2;
int y = (rect.Height() - cyIcon + 1) / 2;
// Draw the icon
dc.DrawIcon(x, y, m_hIcon);
}
else
{
CDialogEx::OnPaint();
}
}
[/CODE]

Just a nudge in the right direction would be greatly appriciated!

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