Using the access text escape. Use two underline characters if you want an underline to appear in your text.

        

<StackPanel xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    x:Class="AccessTextSimple.Pane1">
  <StackPanel>
    <DockPanel Margin="30,10,3,3" >
      <Button Click="hello_Click">
        <AccessText>__He_llo__  Press the ALT key to see the access keys</AccessText>
      </Button>
    </DockPanel>

  </StackPanel>
</StackPanel>
//File:Window.xaml.vb

Imports System
Imports System.Collections.Generic
Imports System.Text
Imports System.Windows
Imports System.Windows.Controls

Namespace AccessTextSimple
  Partial Class Pane1
    Inherits StackPanel
    Public Sub New()
      InitializeComponent()
    End Sub

    Private Sub hello_Click(sender As Object, e As RoutedEventArgs)
      MessageBox.Show("button")
    End Sub
  End Class
End Namespace

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Using the access text escape. Use two underline characters if you want an underline to appear in your text. : AccessText « Windows Presentation Foundation « VB.Net

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