Thanks for contacting us and for reporting this issue.
When the RadDataBoundListBox control is unloaded it recycles all realized visual containers. When the control is re-loaded it starts realizing containers from the last selected item.
I would like to inform you that we are going to update this behavior so that the control behaves exactly like the standard ListBox control from the toolbox. This update will be available in Q2 2011 Beta2, as well as in the official Q2 2011 release of RadControls for Windows Phone 7.
Do not hesitate to get back to us in case you have further questions or need assistance.
the Telerik team
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