WPF Binding RelativeSource

Question

Just doing a little test here. Only the first of these two text boxes displays the value "123". Why doesn't the second?

<Window x:Class="Test.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:diag="clr-namespace:System.Diagnostics;assembly=WindowsBase" Title="MainWindow" Height="350" Width="525"> <StackPanel Width="123" x:Name="Panel1"> <TextBox Text="{Binding ElementName=Panel1, Path=Width, diag:PresentationTraceSources.TraceLevel=High}"></TextBox> <TextBox Text="{Binding Source={RelativeSource AncestorType={x:Type StackPanel}}, Path=Width, diag:PresentationTraceSources.TraceLevel=High}"></TextBox> </StackPanel>

Florian Gl · Accepted Answer · 2012-10-25 21:40:42Z

Instead of Source take RelativeSource, like so:

<TextBox Text="{Binding RelativeSource={RelativeSource AncestorType={x:Type StackPanel}}, Path=Width, diag:PresentationTraceSources.TraceLevel=High}"></TextBox>

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