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Inner Grid resizing

Posted By:      Posted Date: October 07, 2010    Points: 0   Category :WPF

The grid that holds the groups listing in this list box resizes.  I need it to be the exact size of the contents.  Anyone know what to do here?


<ListBox Grid.Row="2" ItemsSource="{Binding Path=Users}" ScrollViewer.VerticalScrollBarVisibility="Disabled">
            <WrapPanel IsItemsHost="True" Orientation="Vertical"/>
            <Grid Margin="0,0,20,0" x:Name="UserItemGrid">
                    <ColumnDefinition />

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