My CellTable is too narrow at first, what could I be doing wrong?

I have a Composite widget that contains a ListBox, and then a CellTable inside a ScrollPanel.

When I first load up the CellTable with data (and set the row count), the columns get scrunched because the CellTable does not use the available horizontal space. But then when I click the down arrow in the ListBox, the CellTable expands to take the amount of space it needs.

I have tried everything I can think of to make it use the space correctly the first time, but have not been successful. Does anyone have any ideas?

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