ポップアップウィンドウが表示されているか判断する

例:

//---------------------------------------------------------------------------
bool __fastcall IsPopupWindowShown()
{
        HWND ownerWindow = Application->Handle;
        HWND lastActivePopupWindow = GetLastActivePopup(ownerWindow);
        return lastActivePopupWindow != ownerWindow && IsWindowVisible(lastActivePopupWindow);
}
//---------------------------------------------------------------------------