I am not sure whether I am logging in a right forum. As this is related to ControlBox on Form I am logging it here.

When I right click on the form at the icon area to show the control box, after the control box is shown clicking anywhere else on the form or on control box context menu item is giving an exception.

Note: The form is having an UltraFormManager & a custom icon.

Seeing the call stack, if you give any hints on possible reason it will be help full to us.

Attached is the exception snapshot.

Call Stack captured from the exception:

************** Exception Text **************

System.ArgumentNullException: Value cannot be null.

Parameter name: container

   at System.Windows.Forms.Timer..ctor(IContainer container)

   at Infragistics.Win.WinTimer..ctor(IContainer container)

   at Infragistics.Win.Utilities.CreateTimer(IContainer container)

   at Infragistics.Win.UltraWinForm.UltraFormManager.StartControlBoxDoubleClickTimer()

   at Infragistics.Win.UltraWinForm.UltraFormManager.ShowSystemMenu(Point screenPoint, Boolean controlBox, Form form, Rectangle exclusionRect, Boolean showMenuUp)

   at Infragistics.Win.UltraWinForm.UltraFormManager.ShowSystemMenu(Point screenPoint, Boolean controlBox, Form form, Rectangle exclusionRect)

   at Infragistics.Win.UltraWinForm.UltraFormManager.ShowSystemMenu(Form form, Rectangle exclusionRect)

   at Infragistics.Win.UltraWinForm.ControlBoxUIElement.OnMouseDown(MouseEventArgs e, Boolean adjustableArea, UIElement& captureMouseForElement)

   at Infragistics.Win.ControlUIElementBase.ProcessMouseDownHelper(Object sender, MouseEventArgs e)

   at Infragistics.Win.ControlUIElementBase.ProcessMouseDown(Object sender, MouseEventArgs e)

   at Infragistics.Win.Utilities.ProcessEvent(Control control, ProcessEvent eventToProcess, EventArgs e)

   at Infragistics.Win.UltraControlBase.OnMouseDown(MouseEventArgs e)

   at Infragistics.Win.UltraWinForm.UltraFormDockArea.OnMouseDown(MouseEventArgs e)

   at System.Windows.Forms.Control.WmMouseDown(Message& m, MouseButtons button, Int32 clicks)

   at System.Windows.Forms.Control.WndProc(Message& m)

   at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)

   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)

   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)