Michael S. Scherotter explains how to use Silverlight Toolkit WrapPanel in your Listbox.
Michael: “One of the great components of the Silverlight Toolkit is a WrapPanel that “Positions child elements in sequential position from left to right, breaking content to the next line at the edge of the containing box.” I wanted to see if I could adapt a Listbox to use the WrapPanel instead of its default vertical StackPanel. It turns out that all I have to do is change the ItemsPanelTemplate to use the WrapPanel.”