Auto Select Textbox

BeWo/View/Detail/CustomerWohnhilfeView.xaml

@@ -36,7 +36,8 @@
                             <Label Content="{Binding Displayname}" />
                             <Button VerticalAlignment="Center" Height="20"
                                     ToolTip="Kategorie umbenennen"
-                                    Margin="3" Content="!" FontFamily="Wingdings">
+                                    Margin="3" Content="!" FontFamily="Wingdings"
+                                    Click="Wohnhilfe_Display_Edit_Button_Click">
                                 <Button.Visibility>
                                     <MultiBinding Converter="{StaticResource BoolVisibilityMultiConverter }">
                                         <Binding Path="IsSelected" RelativeSource="{RelativeSource AncestorType={x:Type TabItem}}" />
@@ -81,6 +82,19 @@
                     </DataTemplate>
                 </TabControl.ContentTemplate>
             </TabControl>
+            <Popup x:Name="popup_Wohnhilfe_Displayname_Edit" 
+                   Placement="Mouse" 
+                   StaysOpen="False" 
+                   Focusable="False"
+                   Opened="popup_Wohnhilfe_Displayname_Edit_Opened">
+                <Border Background="White" 
+                        Padding="3" 
+                        BorderThickness="1" 
+                        BorderBrush="Gray"  
+                        Focusable="False">
+                    <TextBox x:Name="txt_Wohnhilfe_Displayname_Edit" Width="200" Grid.Row="0" Grid.Column="0" Height="23" Margin="3" Text="{Binding Path=SelectedVM.Displayname, UpdateSourceTrigger=PropertyChanged}" />
+                </Border>
+            </Popup>
         </Grid>
     </Grid>
 </UserControl>

BeWo/View/Detail/CustomerWohnhilfeView.xaml.cs

@@ -27,5 +27,21 @@ namespace BeWo.View.Detail
         {
             InitializeComponent();
         }
+
+        private void Wohnhilfe_Display_Edit_Button_Click(object sender, RoutedEventArgs e)
+        {
+            popup_Wohnhilfe_Displayname_Edit.IsOpen = true;
+        }
+
+        private void popup_Wohnhilfe_Displayname_Edit_Opened(object sender, EventArgs e)
+        {
+            Dispatcher.BeginInvoke(System.Windows.Threading.DispatcherPriority.Input, new Action(Textbox_SelectAll));
+        }
+
+        private void Textbox_SelectAll()
+        {
+            txt_Wohnhilfe_Displayname_Edit.Focus();
+            txt_Wohnhilfe_Displayname_Edit.SelectAll();
+        }
     }
 }