When adding a BoundCheckBoxField on a WebDataGrid I can not uncheck the checkboxes that are already checked (the ones that have "true" as value). There are no problems with the unchecked ones (those that have "false" as value).
It seems that the checked checkboxes are readonly and I cant find where to change that property.
The behaviour that I'm facing is the same as this sample http://www.infragistics.com/samples/aspnet/data-grid/checkbox-column. In that sample, you cannot change the checked values (Column "Discontinued").