[Solved] Checked node from code-behind

[T.Y.]

I use with the RadTreeView control -
RadTreeView radTreeView = new RadTreeView ();

I created 
class DataItem()
{
...
List<<DataItem> Items  {get; set;}
}  
in the Page.cs I created a list<DataItem> items  and I was enter my data into it.
radTreeView.ItemSource=items;.
when its run the tree is display.

But I have one problem-
 when I load the application I want a few tree view items to be checked.
I can not  write: radTreeView .Items[0].CheckState  because it "DataItem type and not radTreeViewItem type

how can I do the node to be checked?

thanks

[Bobi]

Hi Toybi,

You can try the following:

1.Subscribe to RadtreeView's Loaded event:

     this.treeView.Loaded += new RoutedEventHandler(TreeView_Loaded);

2.Add the following code:

private void TreeView_Loaded(object sender, RoutedEventArgs e)
        {
            RadTreeViewItem item = treeView.ItemContainerGenerator.ContainerFromIndex(1) as RadTreeViewItem;
            if(item != null)
            {
                item.CheckState = System.Windows.Automation.ToggleState.On;
            }
        }

These examples demonstrate how to get an instance of the item with index "1" and set the CheckState. In the same way you can get whatever item from the collection of items.

In order to select a RadtreeView node all you have to do is simply to get an instance of the desired RadtreeViewItem and set its CheckState property to the desired value.

Note:If you use binding you can get the desired RadTreeViewItem  by using  the following:
      
ItemContainerGenerator.ContainerFromIndex(index) or ItemContainerGenerator.ContainerFromItem(item).

I hope this answers your question.


Best wishes,
Boryana
the Telerik team

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