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Two "balanced" combo boxes(coro)

Hi,
I want to have two columns in the grid of type coro with the following functionality:
The first column will have the same value and labels (ie value P001 and label P001)
The second column will have same number of options as the first column with same values but with different labels (ie value P001, label Product 001)
I want when I select the first column option "P001", the second to be automatically changed to the option with label Product 001 and vice versa (If I select Product 001 in the second column, the selected value in column one to be P001).
Thanks in advance.

Such functionality is availible only for "combo" eXcell type which is availlible only in PRO version. Please see more information about "combo" eXcell type here 
http://dhtmlx.com/docs/products/dhtmlxGrid/doc/new_1_3.html#grid_intcombo
http://dhtmlx.com/docs/products/dhtmlxGrid/doc/articles/Combo_excell.html#grid_art_comboexcell

We are willing to buy the full version, but I haven't found anywhere how this can be implemented even in the full version.
The documentation is not full. Can you give me a code example of how to implement this.