CellList as a dropdown

I want to a CellList that works like a simple ListBox dropdown.
Meaning, it shows exactly 1 row unless you click the drop down button,
then it shows somenumber of rows of data over the stuff below. Anyone
have any ideas? A scrollPanel just doesn't do what I want it to do.
This seems like an obvious use of this item so I'm sure I'm making
this harder than it needs to be.

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