method OnMouseDown: added correction from codeproject site:              A small bug with the drop down combo box column....If you set the EventArgs.Cancel flag on the BeginEdit event to stop the edit it throws a object is null exception.
method OnMouseDown: added correction from codeproject site:
             A small bug with the drop down combo box column....If you set the EventArgs.Cancel flag on the BeginEdit event to stop the edit it throws a object is null exception.


git-svn-id: f0db7149858202e34dcafb4c227becf47bdb40ab@15 907c5300-f82f-0410-99ae-ed938deb68d4

antiduh/XPTable