Background of the control is becoming dark on minimising and maximizing the window

Question

Control background is getting changed after minimizing and maximizing the window. I want the background to be same and transparent.

This is an ActiveX control. which can be used in multiple projects. CEdit is the base class for this control on which I have added some extra feature. I tried setting Bkmode in OnCtlColor and OnCtlColor but it is not working out.

Answer 1

I resolved this by fetching the background color and filling the rec of the control

BOOL CComboBoxCtrl::OnEraseBkgnd(CDC* pDC) 
{
COleControl::OnEraseBkgnd(pDC);
RECT rc,rc1;
GetClientRect(&rc);
// Get the color from the parent window
COLORREF crBkgnd = COleControl::AmbientBackColor();

//Fill the rect to overcome the black background issue
pDC->FillSolidRect(&rc,crBkgnd);

if(inputbox != NULL)
    inputbox->Invalidate(TRUE);
return S_OK;

}