right side arrow to combox box inside grid

We are using dhtmlx cobmo box inside the grid. combo box inside the grid does not show the arrow on the right side ( it is the standard behavior ? ). we need to do to show the arrow right side to combo box in the grid, just like any standard combo box? Is it possible? any API? or configuration changes?

If you use the latest grid version, try to define “combo_v” type instead of “combo” to show arrow: