Synchronize items Width in WrapPanel

if you want to have the same width size for each items in WrapPanel (in in ListBox for sample)
you can use Grid.IsSharedSizeScope= »True » like this

<Window.Resources>
        <DataTemplate DataType="{x:Type local:ColorX}">
            <Grid>
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="Auto"
                                      SharedSizeGroup="ColumnSize" />
                </Grid.ColumnDefinitions>
                <StackPanel Orientation="Horizontal"
                            Margin="2">
                    <Rectangle Width="40"
                               Height="25"
                               Fill="{Binding Brush}"
                               Stroke="Black" />
                    <TextBox Text="{Binding Name}"
                             IsReadOnly="true"
                             Background="Transparent"
                             VerticalAlignment="Center"
                             BorderThickness="0"
                             Margin="4 0 4 0" />
                </StackPanel>
            </Grid>
        </DataTemplate>
    </Window.Resources>
    <Grid>
        <ListBox ItemsSource="{Binding .}"
                 Margin="10"
                 BorderThickness="1"
                 BorderBrush="RoyalBlue"
                 ScrollViewer.HorizontalScrollBarVisibility="Disabled">
            <ListBox.ItemsPanel>
                <ItemsPanelTemplate>
                    <WrapPanel IsItemsHost="True"
                               Grid.IsSharedSizeScope="True" />
                </ItemsPanelTemplate>
            </ListBox.ItemsPanel>
        </ListBox>
    </Grid>