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Convert contents of a ListBoxItem to an instance of Thickness by using the BrushConverter

<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"     x:Class="ThicknessConverter_Csharp.Window1"     Title="ThicknessConverter Sample">   <DockPanel Width="400" HorizontalAlignment="Left" VerticalAlignment="Top">     <TextBlock DockPanel.Dock="Top" FontFamily="Verdana" FontSize="18" FontWeight="Bold" Margin="5">       ThicknessConverter Sample</TextBlock>     <Border Name="border1" Height="300" Width="300" Border.BorderThickness="2" Border.BorderBrush="Black" DockPanel.Dock="Top">       <Grid Height="30" VerticalAlignment="Top">         <Grid.RowDefinitions>           <RowDefinition/>           <RowDefinition/>         </Grid.RowDefinitions>         <TextBlock Grid.Row="0" Name="bThickness"/>         <TextBlock Grid.Row="1" Name="bColor"/>       </Grid>     </Border>     <Grid DockPanel.Dock="Top">       <Grid.RowDefinitions>         <RowDefinition/>         <RowDefinition/>         <RowDefinition/>       </Grid.RowDefinitions>       <Grid.ColumnDefinitions>         <ColumnDefinition/>         <ColumnDefinition/>         <ColumnDefinition/>         <ColumnDefinition/>       </Grid.ColumnDefinitions>       <TextBlock Grid.Row="1" Grid.Column="2" TextWrapping="Wrap">Set the BorderBrush Property:</TextBlock>       <ListBox VerticalAlignment="Top" Grid.Column="3" Grid.Row="1" Width="60" Height="50" Margin="5" SelectionChanged="changeColor">         <ListBoxItem>Red</ListBoxItem>         <ListBoxItem>Green</ListBoxItem>         <ListBoxItem>Blue</ListBoxItem>         <ListBoxItem>Yellow</ListBoxItem>         <ListBoxItem>Orange</ListBoxItem>         <ListBoxItem>Purple</ListBoxItem>         <ListBoxItem>Silver</ListBoxItem>         <ListBoxItem>Pink</ListBoxItem>         <ListBoxItem>Maroon</ListBoxItem>         <ListBoxItem>Brown</ListBoxItem>         <ListBoxItem>Black</ListBoxItem>       </ListBox>     </Grid>   </DockPanel>         </Window> //File:Window.xaml.cs using System; using System.Windows; using System.Windows.Controls; using System.Windows.Documents; using System.Windows.Navigation; using System.Windows.Media; namespace ThicknessConverter_Csharp {   public partial class Window1 : Window   {     public void changeColor(object sender, SelectionChangedEventArgs args)     {       ListBoxItem li2 = ((sender as ListBox).SelectedItem as ListBoxItem);             BrushConverter myBrushConverter = new BrushConverter();             border1.BorderBrush = (Brush)myBrushConverter.ConvertFromString((string)li2.Content);             bColor.Text = "Border.Borderbrush =" + li2.Content.ToString();         }   } }