uint winapiFlag = 0;
                if ((int)e.ButtonFlags != 0)
                {
                    byte f = (byte)e.ButtonFlags;
                    if ((f & (byte)MouseButtonFlags.LeftDown) > 0) winapiFlag |= MOUSEEVENTF_LEFTDOWN;
                    if ((f & (byte)MouseButtonFlags.LeftUp) > 0) winapiFlag |= MOUSEEVENTF_LEFTUP;
                    if ((f & (byte)MouseButtonFlags.RightDown) > 0) winapiFlag |= MOUSEEVENTF_RIGHTDOWN;
                    if ((f & (byte)MouseButtonFlags.RightUp) > 0) winapiFlag |= MOUSEEVENTF_RIGHTUP;