Hi,

I have a strange error that I don't understand. Please view the attached text file for error details.

I have a grid with one column of (mostly) checkboxes. Note these ultracheckbox controls were set manually because the column's data in inconsistent (some cells are blank or contain text). Everything is bound to a manually filled ultradatasource. So far everything works fine.

When a checkbox is checked the SubObjectPropChanged event is caught and used to update the data in the model. The model contains logic to update other data it contains (simple example: checking one checkbox also checks all relevant checkboxes in child objects). These updates need to be reflected in the grid again.

First this was done by replacing all rows in the ultradatasource (it cannot be known how much data has changed so everything need to be updated): This worked ok, but we lost the row expansion state (makes sense because the rows were removed and recreated).

Second solution was to leave the rows in place and set all the cell values (overwriting the old values but maintaining everything else in the grid). This kept the expansion state as desired and updated the rows as desired. All seemed well if not for this one error. It is (occasionally) thrown on this line: 

modelCell.SetValue(gridCell.EditorResolved.Value);

I read the editors value and not the cells value because the event seems to be thrown before the cell has been updated; not much of an issue. However at some point (this line is part of a loop) I get this strange error and I don't know why.

Maybe some1 can shed some light on it?

ty,
Teun

P.S. Swallowing the exception would "solve" the issue and the code would work as expected but obviously I don't want to do that.