rad tree is not getting refreshed

[Puja]

I am binding my Rad TreeView in Silverlight to Dictionary type everything is working fine, but after adding new item in code behind to the dictionary the tree is not getting refreshed, I have called the NotifyPropertyChanged, after that it is again going to get the property also, but its not refreshing the tree, do I need to do some extra steps to refresh?. Anyone please help ASAP.

[Petar Mladenov]

Hi Puja,

 RadTreeView must be bound to collection that implements the INotifyCollectionChanged changed interface - for example the ObservableCollection<>. You can bind your tree to ObservableCollection, created like so -
collection = new ObservableCollection<DataItem>(this.dictionary.Values as IEnumerable<DataItem>)
Is this suitable for you?

Kind regards,
Petar Mladenov
the Telerik team

[Puja]

Hello Petar Mladenov,


Thanks for your quick reply, it worked out now the tree is getting refreshed :). But now I have more issue I have defined a context menu to the node, I am tryiyng to get the Parent RadTreeViewItem but its not getting that, The code i have written to get that is as below,
private void OnContextMenu_Click(object sender, RadRoutedEventArgs args)
  {
   // Get the clicked context menu item
   RadMenuItem senderItem = sender as RadMenuItem;
   // Find the tree item that is associated with the clicked context menu item
   RadTreeViewItem senderFolder = senderItem.ParentOfType<RadTreeViewItem>();
   }
   
   but here senderFolder is null. So I am not able to get the Item.
   
Thanks ,
Puja

[Petar Mladenov]

Hello Puja,

 The best way to get a RadTreeViewItem clicked when opening a RadContextMenu is to use the Opened event of the ContextMenu and the event args like so:

private void RadContextMenu_Opened(object sender, RoutedEventArgs e)
        {
            RadTreeViewItem item = radContextMenu.GetClickedElement<RadTreeViewItem>();

Furthermore, the best way to define ContextMenu in RadTreeView in databinding sceanarios is to use it like a Content of the RadTreeView:

<telerik:RadTreeView x:Name="radTreeView"
                                ItemTemplateSelector="{StaticResource myTemplateSelector}"
                                ItemContainerStyle="{StaticResource treeViewStyle}">

               <telerik:RadContextMenu.ContextMenu>
                   <telerik:RadContextMenu x:Name="radContextMenu"
                                           Opened="RadContextMenu_Opened"
                                           ItemTemplate="{StaticResource contextMenuItemTemplate}"
                                           ItemContainerStyle="{StaticResource contextMenuItemStyle}" />
               </telerik:RadContextMenu.ContextMenu>

           </telerik:RadTreeView>

Please check out this demo where these code snippets are used.
You may also find this sample useful too.

All the best,
Petar Mladenov
the Telerik team

[Puja]

Hello Petar Mladenov,

 Thanks for the reply, but as i think it will add the context menu to all nodes under the tree and I want to add the context menu only to some selected items.

[Petar Mladenov]

Hi Puja,

 I understand. So, can you please confirm that the suggested approach works in your scenario?

Greetings,
Petar Mladenov
the Telerik team

[Puja]

Hello Petar Mladenov,

Hey Thanks,  its working. :) otherwise I was searching for the parent OfType RadTreeViewItem which was taking time.
.