title: how can I change gridview item border when pointer/mouse is over
body: <p>this is my GridView</p>
  
  <pre><code>        &lt;Grid Grid.Column="1" Margin="80,0,0,0"&gt;
              &lt;Grid.RowDefinitions&gt;
                  &lt;RowDefinition Height="50" /&gt;
                  &lt;RowDefinition Height="*" /&gt;
              &lt;/Grid.RowDefinitions&gt;
              &lt;TextBlock Text="aktualności" Style="{StaticResource PageSubheader}" /&gt;
  
              &lt;local:VariableGridView x:Name="listView" Grid.Row="1" Margin="0,2,0,0" IsItemClickEnabled="True" ItemClick="listView_ItemClick" &gt;
                  &lt;local:VariableGridView.ItemTemplate&gt;
                      &lt;DataTemplate&gt;
                          &lt;Grid&gt;
                              &lt;Border&gt;
                                  &lt;Image Source="Templates/LightGray.png" Stretch="UniformToFill"/&gt;
                              &lt;/Border&gt;
                              &lt;StackPanel VerticalAlignment="Top" &gt;
                                  &lt;TextBlock Text="{Binding title}" Height="30" Margin="15,0,15,0"/&gt;
                                  &lt;TextBlock Text="{Binding short}" TextWrapping="NoWrap" Margin="15,0,15,10"/&gt;
                              &lt;/StackPanel&gt;
                          &lt;/Grid&gt;
                      &lt;/DataTemplate&gt;
                  &lt;/local:VariableGridView.ItemTemplate&gt;
                  &lt;local:VariableGridView.ItemsPanel&gt;
                      &lt;ItemsPanelTemplate&gt;
                          &lt;VariableSizedWrapGrid ItemWidth="150" ItemHeight="150" Orientation="Vertical" Margin="0,0,80,0" MaximumRowsOrColumns="3"/&gt;
                      &lt;/ItemsPanelTemplate&gt;
                  &lt;/local:VariableGridView.ItemsPanel&gt;
              &lt;/local:VariableGridView&gt;
          &lt;/Grid&gt;
  </code></pre>
  
  <p>The local class (VariableGridView) is small extension for creating view like in Windows Store. It works OK. I can't do one thing. How to change border when the pointer is over the grid ITEM ? I can't find it. </p>