You can set the DropDownRows property to control this. But it is buried a little deep, and generally requires an event handler to set it.
As, a single combo box cell control is shared among all combo box cells normally. And each cell can potentially have a different list, and may require different drop-down rows.
To handle this, use the CurrentCellShowingDropdown event, and set the property there depending upon the exact row and column. Following are some code examples.
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