I have a situation where certain user edits to a Schedule Item (timetable view) must be confirmed or cancelled.  For example, a user can highlight an Item on the grid and drag its lower boundary down to increase the length (by changing the EndTime on the item).  In certain cases this must be confirm/cancelled.

If the dialog result is cancel, I found I got into a loop because the Calendar was still tracking the mouse. The Calendar continued to fire its Update event which in turn changed the value via the EndTime set accessor on the Item.  After various attempts to remove the item from focus and/or selection I have stumbled on the handy ResetDrag() method in the Calendar.

Using this, in a "cancel edit" situation the EndTime accessor is only called once and I get the behavior I need, but it throws an exception.  It appears that it is still trying to execute a callback or something but that gets a null exception after I have called ResetDrag().  Is there anything I have to clean up before calling that method?

Here is the error.  It occurs immediately after the code execution is complete in my Form which cancels the mouse-driven edit to the Item:

"System.NullReferenceException: Object reference not set to an instance of an object.\r\n   at MindFusion.Scheduling.WinForms.Calendar.OnMouseMove(MouseEventArgs e)\r\n   at System.Windows.Forms.Control.WmMouseMove(Message& m)\r\n   at System.Windows.Forms.Control.WndProc(Message& m)\r\n   at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)\r\n   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)\r\n   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)"

Thanks again