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Define a GridSplitter and Horizontal Alignment Changed

<Window x: Class="GridSplitter_Example.Window1"     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"     Title="GridSplitter Example"> <Grid>   <Grid.ColumnDefinitions>     <ColumnDefinition Name="Col0" />     <ColumnDefinition Name="Col1" />     <ColumnDefinition Name="Col2" />     <ColumnDefinition Name="Col3" />   </Grid.ColumnDefinitions>   <Grid.RowDefinitions>     <RowDefinition Name="Row0" />     <RowDefinition Name="Row1" />     <RowDefinition Name="Row2" />   </Grid.RowDefinitions>   <StackPanel Grid.Row="0" Grid.Column="0" Background="Orange">     <TextBlock>Row 0 Col 0</TextBlock>   </StackPanel>   <StackPanel Grid.Row="1" Grid.Column="0" Background="Blue">     <TextBlock>Row 1 Col 0</TextBlock>   </StackPanel>   <StackPanel Grid.Row="2" Grid.Column="0" Background="Green">     <TextBlock>Row 2 Col 1</TextBlock>   </StackPanel>   <StackPanel Grid.Row="0" Grid.Column="1" Background="Purple">     <TextBlock>Row 0 Col 1</TextBlock>   </StackPanel>   <StackPanel Grid.Row="1" Grid.Column="1" Background="Red">     <TextBlock>Row 1 Col 1</TextBlock>   </StackPanel>   <StackPanel Grid.Row="2" Grid.Column="1" Background="Salmon">    <TextBlock>Row 2 Col 1</TextBlock>   </StackPanel>   <StackPanel Grid.Row="0" Grid.Column="2" Background="MediumVioletRed">     <TextBlock>Row 0 Col 2</TextBlock>   </StackPanel>   <StackPanel Grid.Row="1" Grid.Column="2" Background="SteelBlue">     <TextBlock>Row 1 Col 2</TextBlock>   </StackPanel>   <StackPanel Grid.Row="2" Grid.Column="2" Background="Olive">     <TextBlock>Row 2 Col 2</TextBlock>   </StackPanel>       <GridSplitter Name="myGridSplitter" Grid.Column="1" Grid.Row="1" Width="5"/>   <StackPanel Grid.Column="3" Grid.RowSpan="3" Background="Brown">   <TextBlock FontSize="14" Foreground="Yellow">Property Settings</TextBlock>     <StackPanel>       <TextBlock >HorizontalAlignment</TextBlock>       <RadioButton Name="HorizontalAlignmentLeft" Checked="HorizontalAlignmentChanged" GroupName="HorizontalAlignmentProperty">         Left       </RadioButton>       <RadioButton Name="HorizontalAlignmentRight" Checked="HorizontalAlignmentChanged" IsChecked="true" GroupName="HorizontalAlignmentProperty">         Right (default)       </RadioButton>       <RadioButton Name="HorizontalAlignmentCenter" Checked="HorizontalAlignmentChanged" GroupName="HorizontalAlignmentProperty">         Center       </RadioButton>       <RadioButton Name="HorizontalAlignmentStretch" Checked="HorizontalAlignmentChanged" GroupName="HorizontalAlignmentProperty">         Stretch       </RadioButton>     </StackPanel>   </StackPanel> </Grid> </Window> //File:Window.xaml.vb Imports System Imports System.Windows Imports System.Windows.Controls Imports System.Windows.Data Imports System.Windows.Documents Imports System.Windows.Media Imports System.Windows.Navigation Imports System.Windows.Shapes Namespace GridSplitter_Example   Public Partial Class Window1     Inherits Window     Public Sub New()       InitializeComponent()     End Sub     Private Sub HorizontalAlignmentChanged(sender As Object, e As RoutedEventArgs)       If CType(HorizontalAlignmentLeft.IsChecked, [Boolean]) Then         myGridSplitter.HorizontalAlignment = HorizontalAlignment.Left       ElseIf CType(HorizontalAlignmentRight.IsChecked, [Boolean]) Then         myGridSplitter.HorizontalAlignment = HorizontalAlignment.Right       ElseIf CType(HorizontalAlignmentCenter.IsChecked, [Boolean]) Then         myGridSplitter.HorizontalAlignment = HorizontalAlignment.Center       ElseIf CType(HorizontalAlignmentStretch.IsChecked, [Boolean]) Then         myGridSplitter.HorizontalAlignment = HorizontalAlignment.Stretch       End If     End Sub   End Class End Namespace