VitNX_DockGroup.OnMouseDown Method

protected override void OnMouseDown(MouseEventArgs e)
 {
     base.OnMouseDown(e);
     if (_tabArea.DropdownRectangle.Contains(e.Location))
     {
         _tabArea.DropdownHot = true;
         return;
     }
     foreach (var tab in _tabs.Values)
     {
         var rect = RectangleToTabArea(tab.ClientRectangle);
         if (rect.Contains(e.Location))
         {
             if (e.Button == MouseButtons.Middle)
             {
                 tab.DockContent.Close();
                 return;
             }
             var closeRect = RectangleToTabArea(tab.CloseButtonRectangle);
             if (closeRect.Contains(e.Location))
             {
                 _tabArea.ClickedCloseButton = tab;
                 return;
             }
             else
             {
                 DockPanel.ActiveContent = tab.DockContent;
                 EnsureVisible();
                 _dragTab = tab;
                 return;
             }
         }
     }
     if (VisibleContent != null)
         DockPanel.ActiveContent = VisibleContent;
 }