HierarchicalDataTemplate TreeviewItem

Question

Hi

I have the following xaml:

<TreeView x:Name="tvCategoryList" Grid.Column="0" Padding="0" ItemsSource="{Binding CategoriesList}">
  <TreeView.ItemTemplate>
    <HierarchicalDataTemplate ItemsSource="{Binding Items}">
      <TextBlock Text="{Binding ItemName}"/>
    </HierarchicalDataTemplate>
  </TreeView.ItemTemplate>
</TreeView>

In the above code i'm binding ObservableCollection CategoriesList where the class CustomTreeItem has a Visibility property. How could i change the above code to bind the Visibility property so that it gets updated everytime (set to either visibile or collapsed) an item gets selected / de-selected?