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TreeGrid cell background image

I need to let users know that a combobox excelltype must be double-clicked to dropdown the options.

Is it possible to set a background image for a cell that is a combobox or can you suggest another way to clearly show users that a cell is a combobox and must be double-clicked?

thank you.

There is no way to defined custom style per column, but you can do it for necessary cells directly from XML
    <row id="some">
       <cell>Some here</cell>
       <cell style="background-image:url(some.gif)">Some here</cell>
       <cell>Some here</cell>