In order to control the items showing in dropdown of combo box, GridComboBoxListBoxPart.DropDownRows property can be used. The GridComboBoxListBoxPart is the actual control type of the list that is dropped to display the items. But, it is buried a little deep and generally needs an event handler to set it.
The reason for using an event handler is that normally a single ComboBox control is shared among all ComboBox cells. Each cell can potentially have a different list and may need different numbers of visible rows. So to handle this, you must catch Grid.CurrentCellShowingDropDown event and set the property there depending upon the exact row and column.
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