title: Change image.Source in ListView according to boolean
body: <p>I have a listview with 2 columns: "visibility" and "name" of a system. The value of column 1: a button (btn_visibility) with an image (img_visibility).</p>
  
  <p>Depending on a boolean (true or false) from an object in code behind the image should change, e.g. SYSTEM.SHOW_IN_LIST = true; img_visibility.Source = new BitmapImage(new Uri(App.CONTROLLER.PATHS.PATH_TO_MINUS));</p>
  
  <p>An image is reachable under following relative path: App.CONTROLLER.PATHS.PATH_TO_"Name of my image", e.g. App.CONTROLLER.PATHS.PATH_TO_ADD;</p>
  
  <p><strong>My xaml-code in SystemmanagementWindow.xaml:</strong></p>
  
  <pre><code>&lt;ListView x:Name="lv_Systems" HorizontalAlignment="Left" Height="227" Margin="313,5,0,0" VerticalAlignment="Top" Width="153" SelectedIndex="0" SelectionChanged="listView_Systems_SelectionChanged"&gt;
          &lt;ListView.View&gt;
              &lt;GridView&gt;
                  &lt;GridViewColumn Header="{x:Static p:Resources.SystemmanagementWindow_listView_col_1}" DisplayMemberBinding="{Binding SYSTEMNAME}" Width="110"/&gt;
                  &lt;GridViewColumn Header="{x:Static p:Resources.SystemmanagementWindow_listView_col_2}"  Width="34"&gt;
                      &lt;GridViewColumn.CellTemplate&gt;
                          &lt;DataTemplate&gt;
                              &lt;Button Click="EditVisibility" CommandParameter="{Binding}" Width="20"&gt;
                                  &lt;Image x:Name="img_visibility" width="10" Height="10"/&gt;
                              &lt;/Button&gt;
                          &lt;/DataTemplate&gt;
                      &lt;/GridViewColumn.CellTemplate&gt;
                  &lt;/GridViewColumn&gt;
              &lt;/GridView&gt;
          &lt;/ListView.View&gt;
      &lt;/ListView&gt;
  </code></pre>
  
  <p>Many thanks in advance!</p>