In our case the listbox is based on a class which has When and Init event. Also the listbox is in container. Did you try to set IntegralHeight to true? What is the row source for the list?

I'm trying to figure out, which properties or environment settings produce this behavior...

>dblclick has code
>click has code
>gotfocus has code
>init has code
>interactivechange has code
>lostfocus has code
>when has code
>
>>>>>So, you're saying, that it's a generic bug in VFP9 with listboxes on a pageframe?
>>>
>>>I'm wondering <s> if its an common anomoly with listboxes and containers/pageframes...
>>
>>In our case the listbox has This.Parent.Parent.Parent.aDEDataAccess as RowSource. The method code is in DoubleClick, the IntegralHeight property is set to true. The fontname and fontsize are not VFP default.
>>
>>What non default properties do you have for the listbox?