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How to include sortable columns from another table?

I have 2 tables (let''s call it parent and child) with relations, and a GDBG bound to the child table. The child table contains a expression column (i.e. "Parent(relation).col"). When the parent table data is updating, I can see the change reflected on the grid. I can sort on the particular column. If the child table starts to update its content, and at the same time I am sorting on the expression column, sooner or later the grid crashes with NullReferenceException. I think it is a DataView problem, I am just wondering if anyone has a workaround?

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