Use Keyboard.Focus to set the focus to a Text Field

    


<Window 
  x:Class="WpfApplication1.Window1"
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  Title="Window1" Height="600" Width="800">
  <DockPanel>
    <StackPanel DockPanel.Dock="Bottom" Orientation="Horizontal">
      <TextBox x:Name="tbxInsertionText" Width="200" Margin="5,0" />
      <Button DockPanel.Dock="Bottom" Content="Insert" Click="btnInsert_Click"/>
    </StackPanel>
    <RichTextBox x:Name="rtbTextContent" />
  </DockPanel>
</Window>
//File:Window.xaml.vb
Imports System.Windows
Imports System.Windows.Documents
Imports System.Windows.Input

Namespace WpfApplication1
  Public Partial Class Window1
    Inherits Window
    Public Sub New()
      InitializeComponent()
    End Sub

    Private Sub btnInsert_Click(sender As Object, e As RoutedEventArgs)
      If String.IsNullOrEmpty(tbxInsertionText.Text) Then
        Return
      End If
      rtbTextContent.BeginChange()
      If rtbTextContent.Selection.Text <> String.Empty Then
        rtbTextContent.Selection.Text = String.Empty
      End If
      Dim tp As TextPointer = rtbTextContent.CaretPosition.GetPositionAtOffset(0, LogicalDirection.Forward)
      rtbTextContent.CaretPosition.InsertTextInRun(tbxInsertionText.Text)
      rtbTextContent.CaretPosition = tp
      rtbTextContent.EndChange()
      Keyboard.Focus(rtbTextContent)
    End Sub
  End Class
End Namespace

1.	Creating a KeyBinding between the Open command and Ctrl-R
2.	Command Handler Key Binding
3.	Provide Quick Keyboard Access to Buttons
4.	Reading keyboard modifiers
5.	Reading individual key state with Keyboard.IsKeyDown
6.	Use InputBinding to bind Application commends to Key events
7.	Suppress Keyboard and Mouse Events
8.	Query Left / Right control key
9.	Is Key.CapsLock Toggled
10.	Keyboard.IsKeyToggled
11.	Query Number lock key
12.	Use KeyBinding to bind Key event to TextBox.InputBindings
13.	Custom Command by KeyGesture and RoutedUICommand
14.	TextBox PreviewKeyDown, PreviewKeyUp, PreviewTextInput, KeyDown, KeyUp and TextChanged events
15.	StackPanel PreviewTextInput and PreviewKeyDown
16.	If input is not a number do not handle the key event
17.	RoutedEvents: Tunneled Key Press
18.	On Key Down Handler

Use Keyboard.Focus to set the focus to a Text Field : Key Event « Windows Presentation Foundation « VB.Net

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