Keep selection in a ListView when updating model

[luca]

Hi all,
I need some ideas to keep the current selection in a ListView when I update the model.

Is it possible?

[luca]

I'll be more detailed.
I have an XmlListModel and I show the data in a ListView. The ListView is selectable so I can select an element of the list.

Sometimes (with a timer) I update the xml data of the model but every time I update I lose the current selection and the list scroll to the top.
Is there a way to avoid this problem?