I have a grid grouping control which gets its data from an SQL server database table. All good until, for some reason, I cannot change the settings of the grid in the properties windows.
The error is Property values is not valid and in"Details" - Object reference not set to an instance of an object. It does that for any properties I try to change from the designer.
I attached the screen with the error and also the project in RAR format.
Hope you can help me.