private void OnChildWndProcHitTest(object sender, ViewControlHitTestArgs e) { if (_ribbonTabs != null) { if (_ribbonTabs.GetViewForSpare != null) { if (_ribbonTabs.GetViewForSpare.ClientRectangle.Contains(e.Point)) { e.Cancel = false; e.Result = (IntPtr)PI.HTTRANSPARENT; } } } }