>I'm having a problem with a combobox showing up blank ...
>
>It is on page 3 of a pageframe. The first time I select this page, the display is correct. If I select another page, and then return to page 3, it is empty. However, if I then click on it, it displays correctly.
>

RowSourceType = 5
>RowSource = 'This.aRowSource'
>BoundTo = .T.
>BoundColumn = 2

>
>The ControlSource is numeric.
>
>Anybody with any suggestions?

Try switching RowSource/RowSourceType statements around. I think we had a similar problem - I will need to dig for the solution.
You may do something like

this.ListIndex = this.ListIndex or similar things...