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LastChildFill Property
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DockPanel.LastChildFill Property

Gets or sets a value that indicates whether the last child element within a DockPanel stretches to fill the remaining available space.

Namespace: System.Windows.Controls
Assembly: PresentationFramework (in presentationframework.dll)
XML Namespace:  http://schemas.microsoft.com/winfx/2006/xaml/presentation

public bool LastChildFill { get; set; }
/** @property */
public boolean get_LastChildFill ()

/** @property */
public void set_LastChildFill (boolean value)

public function get LastChildFill () : boolean

public function set LastChildFill (value : boolean)

<object LastChildFill="bool" .../>

Property Value

true if the last child element stretches to fill the remaining space; otherwise false. The default value is true.

If you set the LastChildFill property to true, which is the default setting, the last child element of a DockPanel always fills the remaining space, regardless of any other dock value that you set on the last child element. To dock a child element in another direction, you must set the LastChildFill property to false and must also specify an explicit dock direction on the last child element.

The following example creates a simple user interface (UI) framework using a DockPanel element. The DockPanel partitions available space to its child elements.

This example uses the Dock property, which is an attached property, to dock two identical Border elements at the Top of the partitioned space. A third Border element is docked to the Left, with its width set to 200 pixels. A fourth Border is docked to the Bottom of the screen. The last Border element automatically fills the remaining space.


// Create the application's main window
mainWindow = new Window ();
mainWindow.Title = "DockPanel Sample";

// Create the DockPanel
DockPanel myDockPanel = new DockPanel();
myDockPanel.LastChildFill = true;

// Define the child content
Border myBorder1 = new Border();
myBorder1.Height = 25;
myBorder1.Background = Brushes.SkyBlue;
myBorder1.BorderBrush = Brushes.Black;
myBorder1.BorderThickness = new Thickness(1);
DockPanel.SetDock(myBorder1, Dock.Top);
TextBlock myTextBlock1 = new TextBlock();
myTextBlock1.Foreground = Brushes.Black;
myTextBlock1.Text = "Dock = Top";
myBorder1.Child = myTextBlock1;

Border myBorder2 = new Border();
myBorder2.Height = 25;
myBorder2.Background = Brushes.SkyBlue;
myBorder2.BorderBrush = Brushes.Black;
myBorder2.BorderThickness = new Thickness(1);
DockPanel.SetDock(myBorder2, Dock.Top);
TextBlock myTextBlock2 = new TextBlock();
myTextBlock2.Foreground = Brushes.Black;
myTextBlock2.Text = "Dock = Top";
myBorder2.Child = myTextBlock2;

Border myBorder3 = new Border();
myBorder3.Height = 25;
myBorder3.Background = Brushes.LemonChiffon;
myBorder3.BorderBrush = Brushes.Black;
myBorder3.BorderThickness = new Thickness(1);
DockPanel.SetDock(myBorder3, Dock.Bottom);
TextBlock myTextBlock3 = new TextBlock();
myTextBlock3.Foreground = Brushes.Black;
myTextBlock3.Text = "Dock = Bottom";
myBorder3.Child = myTextBlock3;

Border myBorder4 = new Border();
myBorder4.Width = 200;
myBorder4.Background = Brushes.PaleGreen;
myBorder4.BorderBrush = Brushes.Black;
myBorder4.BorderThickness = new Thickness(1);
DockPanel.SetDock(myBorder4, Dock.Left);
TextBlock myTextBlock4 = new TextBlock();
myTextBlock4.Foreground = Brushes.Black;
myTextBlock4.Text = "Dock = Left";
myBorder4.Child = myTextBlock4;

Border myBorder5 = new Border();
myBorder5.Background = Brushes.White;
myBorder5.BorderBrush = Brushes.Black;
myBorder5.BorderThickness = new Thickness(1);
TextBlock myTextBlock5 = new TextBlock();
myTextBlock5.Foreground = Brushes.Black;
myTextBlock5.Text = "This content will Fill the remaining space";
myBorder5.Child = myTextBlock5;


// Add child elements to the DockPanel Children collection
myDockPanel.Children.Add(myBorder1);
myDockPanel.Children.Add(myBorder2);
myDockPanel.Children.Add(myBorder3);
myDockPanel.Children.Add(myBorder4);
myDockPanel.Children.Add(myBorder5);
           
// Add the parent Canvas as the Content of the Window Object
mainWindow.Content = myDockPanel;
mainWindow.Show ();


<Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" WindowTitle="DockPanel Sample">
  <DockPanel LastChildFill="True">
    <Border Height="25" Background="SkyBlue" BorderBrush="Black" BorderThickness="1" DockPanel.Dock="Top">
      <TextBlock Foreground="Black">Dock = "Top"</TextBlock>
    </Border>
    <Border Height="25" Background="SkyBlue" BorderBrush="Black" BorderThickness="1" DockPanel.Dock="Top">
      <TextBlock Foreground="Black">Dock = "Top"</TextBlock>
    </Border>
    <Border Height="25" Background="LemonChiffon" BorderBrush="Black" BorderThickness="1" DockPanel.Dock="Bottom">
      <TextBlock Foreground="Black">Dock = "Bottom"</TextBlock>
    </Border>
    <Border Width="200" Background="PaleGreen" BorderBrush="Black" BorderThickness="1" DockPanel.Dock="Left">
      <TextBlock Foreground="Black">Dock = "Left"</TextBlock>
    </Border>
    <Border Background="White" BorderBrush="Black" BorderThickness="1">
      <TextBlock Foreground="Black">This content will "Fill" the remaining space</TextBlock>
    </Border>
  </DockPanel>
</Page>

NoteNote:

By default, the last child of a DockPanel element fills the remaining unallocated space. If you do not want this behavior, set LastChildFill="False".

The compiled application yields a new UI that looks like this.

A typical DockPanel scenario.

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0

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