GridGroupingControl: How to show null-boolean ?

[Administrator]

Hello.
The question is:

For GridGroupingControl, how to identify that boolean field has null value instead of false ?

For example, in standart DataGrid there was third-state checkbox.

Thank you.

[Administrator]

You set the GridStyleInfo.TriState property for that column.

this.gridGroupingControl1.TableDescriptor.Columns["Deleted"].Appearance.AnyRecordFieldCell.TriState = true;