Finding the border that is generated by the ControlTemplate of the Button
<Window x:Class="WpfApplication1.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="WPF" Height="100" Width="160">
<Window.Resources>
<ControlTemplate x:Key="buttonTemplate" TargetType="{x:Type Button}">
<Border x:Name="border" BorderThickness="3" BorderBrush="DarkGray" Background="LightGray">
<ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center"/>
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter TargetName="border" Property="Background" Value="Orange"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Window.Resources>
<Grid>
<Button x:Name="button" Height="24" HorizontalAlignment="Stretch" Content="Custom Template"
Template="{StaticResource buttonTemplate}" Click="Button_Click">
</Button>
</Grid>
</Window>
//File:Window.xaml.vb
Imports System
Imports System.Windows
Imports System.Windows.Controls
Namespace WpfApplication1
Public Partial Class Window1
Inherits Window
Public Sub New()
InitializeComponent()
End Sub
Private Sub Button_Click(sender As Object, e As RoutedEventArgs)
Dim borderInTemplate As Border = DirectCast(button.Template.FindName("border", button), Border)
Console.WriteLine(borderInTemplate.GetValue(Border.ActualWidthProperty))
End Sub
End Class
End Namespace
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