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dhtmlxCombo - possible to add unselectable options?

Hello

Is it possible to add options to the combo control that arent selectable?
I want to use them as headers for grouping options.

For example:

Cars <--- not selectable
-Ferrari
-Volvo
-Mazda
Animals <---- not selectable
-Cat
-Elephant
-Dog

I have seen the grouping examples using several combo controls - but that is not for me. I only want to use one combobox.

Thanks