System.Windows.Forms.Form.SetVisibleCore(Boolean) at WeifenLuo.WinFormsUI.Docking.DockContentHandler.SetVisible()
at WeifenLuo.WinFormsUI.Docking.DockPane.set_ActiveContent(WeifenLuo.WinFormsUI.Docking.IDockCont
System.Windows.Forms.Control.CreateHandle()at System.Windows.Forms.Control.get_Handle()
at WeifenLuo.WinFormsUI.Docking.DockPanel.DragHandlerBase.BeginDragDocuments\Visual Studio 2008\Projects\DockPanel\WinFormsUI\Docking\DockPanel.DragHandler.cs