Hello

In our project we use Infragistics2.Win.UltraWinDock.v6.1 and sometimes we have an exception, when moving or resizing panes:

************** Text **************
System.NotSupportedException: A pane's docked state cannot be determined until it has been associated with a DockAreaPane
   в Infragistics.Win.UltraWinDock.DockablePaneBase.get_DockedState()
   в Infragistics.Win.UltraWinDock.PaneSettingsResolved.ResolveCaptionAppearance(AppearanceData& appearance, AppearancePropFlags& requestedProps, Boolean isActive, Boolean isHot)
   в Infragistics.Win.UltraWinDock.DockablePaneBase.PaneMetrics.UpdateCaptionSizeInfo()
   в Infragistics.Win.UltraWinDock.DockablePaneBase.PaneMetrics.UpdateSizeInformation()
   в Infragistics.Win.UltraWinDock.DockablePaneBase.PaneMetrics.get_CaptionSize()
   в Infragistics.Win.UltraWinDock.PaneUIElement.PositionPaneElements(Rectangle workRect, DockablePaneBase pane, UIElementsCollection oldElements)
   в Infragistics.Win.UltraWinDock.PaneUIElement.PositionChildElements()
   в Infragistics.Win.UIElement.VerifyChildElements(ControlUIElementBase controlElement, Boolean recursive)
   в Infragistics.Win.UIElement.VerifyChildElements(ControlUIElementBase controlElement, Boolean recursive)
   в Infragistics.Win.UIElement.VerifyChildElements(Boolean recursive)
   в Infragistics.Win.UltraWinDock.UltraDockManager.VerifyPaneControlElements(Control control)
   в Infragistics.Win.UltraWinDock.UltraDockManager.VerifyPaneControlElements(Control control)
   в Infragistics.Win.UltraWinDock.AutoHideSplitterUIElement.ApplyAdjustment(Point delta)
   в Infragistics.Win.AdjustableUIElement.OnMouseUp(MouseEventArgs e)
   в Infragistics.Win.ControlUIElementBase.ProcessMouseUpHelper(Object sender, MouseEventArgs e)
   в Infragistics.Win.ControlUIElementBase.ProcessMouseUp(Object sender, MouseEventArgs e)
   в System.Windows.Forms.Control.OnMouseUp(MouseEventArgs e)
   в Infragistics.Win.UltraWinDock.DockControlBase.OnMouseUp(MouseEventArgs e)
   в System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
   в System.Windows.Forms.Control.WndProc(Message& m)
   в System.Windows.Forms.ScrollableControl.WndProc(Message& m)
   в System.Windows.Forms.ContainerControl.WndProc(Message& m)
   в System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   в System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   в System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

From system event log:

EventType clr20r3, P1 netclient.exe, P2 1.0.0.6, P3 4b0bb70c, P4 mscorlib, P5 2.0.0.0, P6 4a7cd8f7, P7 170c, P8 22, P9 system.invalidoperationexception, P10 NIL.