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Expand a specific node in the treeGrid

Hi,

We have dhtmlxTreeGrid professional version 1.4. I am looking for a method to expand a specific row in the tree grid. I only found the method expandAll() to expand all the tree structures. Is there a way to only expand a specific tree structure?

Thanks,
Danielle

There is a
   grid.openItem(rowId);
method, which can be used to expand some specific row instead of whole hierarchy