问题：Internet Explorer中的控件在可见之前没有被创建

Knowledge Base
Q195188 PRB: ActiveX Control Window Is Not Created Until Visible in Internet Explorer
使用知识库里面的方法
// CMyControl is derived from CComControl
STDMETHOD(SetClientSite)(IOleClientSite *pClientSite)
{
if (pClientSite)
{
RECT rc = {0,0,0,0};
// Don't have access to the container's window so just use the
// desktop. Window will be resized correctly during in-place
// activation.
HWND hWnd = CreateControlWindow(::GetDesktopWindow(), rc);
_ASSERT (hWnd);
}
return IOleObjectImpl::SetClientSite (pClientSite);
}
在Windows XP中，可以在任务栏上看到控件的窗口，很是不雅观
解决的方法是尽可能用GetForegroundWindow替代GetDesktopWindow（GetForegroundWindow有时返回NULL）