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WebHierarchicalDataGrid Expand/Collapse

I have a WebHierarchicalDataGrid in place and its works fine if i had data in both the parent and child tables.

Say, if i clear my child table referered in the Grid and display the grid. I get the Parent rows visible but i cannot see the expand/collapse button.

Yes, since there are no data in the child table it does not show the expand/collapse button.

But , what i need is to show the expand/collapse button and once i click that the Add new row should be visible.

Suggest me to proceed further.