After I upgraded to the 1.6.5, I get the error below when I press the delete key to clear the date value of the datetimepicker control which is bound to a date field of a business object.   Although I get this error, the database is being updated properly.  Why is this error is occurring?

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Object reference not set to an instance of an object.
  Exception (NullReferenceException): Source="MicroFour StrataFrame UI"; Target=null; Tag=null;
    Message = "Object reference not set to an instance of an object."
  Environment: ThreadIdentity="" DateTime=["2008-04-29 16:31:15.908"] ThreadName=null WindowsIdentity="STRUSS\JPagley" ThreadId="10" DomainName="CMPR.vshost.exe" OSVersion=["Microsoft Windows NT 5.1.2600 Service Pack 2"] MachineName="1LPJPAGLEY"
    UserName="JPagley"
  Remaining Stack Trace  - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    at MicroFour.StrataFrame.UI.Windows.Forms.DateTimePicker.CreateManualCaret()
    at MicroFour.StrataFrame.UI.Windows.Forms.DateTimePicker.OnGotFocus(EventArgs e)
    at System.Windows.Forms.Control.WmSetFocus(Message& m)
    at System.Windows.Forms.Control.WndProc(Message& m)
    at System.Windows.Forms.DateTimePicker.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)