Adding search to Combo within a Grid

I want to add the ability to search for a substring in the list of options in a combo box (it has 600+ options!)…

I see we can do:
dhxCombo.enableFilteringMode(“between”);

However, if it is part of a grid, how can I add this option?

Here you can find a tutorial about the usage of the dhtmlxcombo (“combo” exCell) in the dhtmlxgrid:
docs.dhtmlx.com/grid__combo_integration.html