[Solved] Visible/invisible expander at TreeviewNode manually?

[Huy Truong The]

Dear,

My purpose is to visible expander symbol at TreeviewNode which has child nodes and invisible expander symbol at TreeviewNode which does not have any childnodes manually.
Example
+AA
BB (no childnode)
CC (no childnode)
+DD

I load data for limited level at once (not all data)

Do you have any SET method to control expander symbol display or not? I can not find this SET method in this object control. Thank you for your helps.

Best regards,
Huy

[Valentin.Stoychev]

Hello Huy Truong The,

You can use the load on demand feature of the RadTreeView. Check this online sample:
http://demos.telerik.com/silverlight/#TreeView/LoadOnDemand

Here is the code that you wil need:

<telerikNavigation:RadTreeView IsEditable="True" IsLoadOnDemandEnabled="True" LoadOnDemand="RadTreeView1_LoadOnDemand" x:Name="RadTreeView1">
                <telerikNavigation:RadTreeViewItem Header="ITem1" x:Name="Item1"></telerikNavigation:RadTreeViewItem>
            </telerikNavigation:RadTreeView>

        private void RadTreeView1_LoadOnDemand(object sender, Telerik.Windows.RadRoutedEventArgs e)
        {
            RadTreeViewItem item = e.OriginalSource as RadTreeViewItem;
            item.IsLoadOnDemandEnabled = false;
           // load the data for this item here
        }

Greetings,
Valentin.Stoychev
the Telerik team

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