[MFC] CProgressCtrl - Change progress bar color with themes enabled

void CMyProgress::OnPaint()
{
    CPaintDC dc(this); // device context for painting
    CRect clientRect ;
    CRect windowRect;

    GetWindowRect(windowRect);
    windowRect.SetRect(0, 0, windowRect.Width(), windowRect.Height());

    GetClientRect(clientRect);
    clientRect.SetRect(1, 1, windowRect.Width() + 1, windowRect.Height() + 1);

    // Draw the border of the progress control. Use a standard 3D border
    dc.Draw3dRect(windowRect, GetSysColor(COLOR_3DSHADOW), GetSysColor(COLOR_3DLIGHT));

    CRect barRect = clientRect;
    //Is Control Horizontal or Vertical.
    if(! GetStyle() && PBS_VERTICAL)
    {
        int rangeLow, rangeHigh;
        GetRange(rangeLow, rangeHigh);

        int x = GetPos(), y;

        if(x < rangeLow || x > rangeHigh)
        return;

        // Calculate the width

        x -= rangeLow;
        x *= 100;
        x /= (rangeHigh - rangeLow);

        y = clientRect.Width();
        y *= x;
        y /= 100;
        y += clientRect.left;

        // Using the y variable as the new width, define a new rectangle

        barRect.right = barRect.left + y;
    }
    else
    {
        int rangeLow, rangeHigh;
        GetRange(rangeLow, rangeHigh);

        int y = GetPos(), x;

        if(y < rangeLow || y > rangeHigh)
        return;

        //Calculate Height
        y -= rangeLow;
        y *= 100;
        y /= (rangeHigh - rangeLow);

        x = clientRect.Height();
        x *= y;
        x /= 100;
        x += clientRect.top;

        
        barRect.top = barRect.bottom - x;

    }
    // Use barRect as the rectangle for drawing the progress bar.
    CBrush brush;
    brush.CreateSolidBrush(m_BarColour);
    dc.FillRect(barRect, &brush);

}