How to hide borders of combox and only show the bottom border in MFC?-CodePudding

I'm want to make a flat design ComboBox which only shows a blue bottom border. But I can only change 4 borders' color. How to hide right,left and top border and show bottom border?

CodePudding user response：

Finally I made it. Just rewrite OnPaint() function and use CDC::DrawEdge(CRect, BDR_RAISEDINNER, BF_BOTTOM) to drwa a bottom border.

void CCustomComboBox::OnPaint()
{
    CPaintDC dc(this);
    CRect rc;
    GetClientRect(&rc);
    dc.DrawEdge(rc, BDR_RAISEDINNER, BF_BOTTOM);

    ...   //draw other parts of ComboBox
}