How do I configure a TextBox control to automatically resize itself vertically when text no longer fits on one line?

Question

How do I configure a TextBox control to automatically resize itself vertically when text no longer fits on one line?

For example, in the following XAML:

<DockPanel LastChildFill="True" Margin="0,0,0,0">
  <Border Name="dataGridHeader" 
    DataContext="{Binding Descriptor.Filter}"
    DockPanel.Dock="Top"                         
    BorderThickness="1"
    Style="{StaticResource ChamelionBorder}">
  <Border
    Padding="5"
    BorderThickness="1,1,0,0"                            
    BorderBrush="{DynamicResource {ComponentResourceKey TypeInTargetAssembly=dc:NavigationPane, 
    ResourceId={x:Static dc:NavigationPaneColors.NavPaneTitleBorder}}}">
    <StackPanel Orientation="Horizontal">
      <TextBlock                                
        Name="DataGridTitle"                                                                                                
        FontSize="14"
        FontWeight="Bold"                                    
        Foreground="{DynamicResource {ComponentResourceKey 
        TypeInTargetAssembly=dc:NavigationPane, 
        ResourceId={x:Static dc:NavigationPaneColors.NavPaneTitleForeground}}}"/>
      <StackPanel Margin="5,0"  Orientation="Horizontal" 
              Visibility="{Binding IsFilterEnabled, FallbackValue=Collapsed, Mode=OneWay, Converter={StaticResource BooleanToVisibility}}"
              IsEnabled="{Binding IsFilterEnabled, FallbackValue=false}"  >                                    
          <TextBlock  />                                                                
          <TextBox    
            Name="VerticallyExpandMe"
            Padding="0, 0, 0, 0"  
            Margin="10,2,10,-1"                                                                                                                                                                                                                     
            AcceptsReturn="True"
            VerticalAlignment="Center"                                    
            Text="{Binding QueryString}"
            Foreground="{DynamicResource {ComponentResourceKey 
            TypeInTargetAssembly=dc:NavigationPane, 
            ResourceId={x:Static dc:NavigationPaneColors.NavPaneTitleForeground}}}">
          </TextBox>
        </StackPanel>                               
    </StackPanel>
  </Border>              
  </Border>
</DockPanel>

The TextBox control named "VerticallyExpandMe" needs to automatically expand vertically when the text bound to it does not fit on one line. With AcceptsReturn set to true, TextBox expands vertically if I press enter within it, but I want it do do this automatically.

Answer 1

Alternatively, you could constrain your TextBlock's Width by binding it to a parent's ActualWidth, for example:

<TextBlock Width="{Binding ElementName=*ParentElement*, Path=ActualWidth}" 
           Height="Auto" />

This will force it to resize its height automatically too.