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In our current project we came across an issue with your treeGrid.

If you have a row with the same ID appearing twice, it will not function correctly.

On selects will select the last rendered element, not necessarily the desired element.

Do you have any advice or potential solutions?

The core functionality of dhtmlxGrid is based on UNIQUE id. If id is not unique, grid can't detect which row must be used in action. The only solution is to use unique id.

Having solved the problem mentioned above, you may also look through the possible related problems with combo boxes java and control java script.