Grid linked to grid

The online link is below:
http://dhtmlx.com/docs/products/dhtmlxGrid/samples/13_interaction_other_components/04_pro_linked_grid.html
when I edit the author column in another grid, the opend grid will be close if I click the grid header, but I hope the opend grid to do nothing when I click the header.

Unfortunately such feature is not supported.

Feature? Obviously,it is a bug. But I have fixed it myself.

I apologize for misunderstanding.
Your issue is confirmed. And your solution will be included in the future versions of dhtmlxGrid.