loading expander icon in treeview

[Alex]

Hi. Sometimes when I expand a tree node children won't load and the loading icon to the left of the node keep spinning (see picture attached). Up to now it only happend 3 times, but could you please let me know why it is doing it and if there is a fix?

Thanks,

Alex

[Petar Mladenov]

Hi Alex,

It is important what you do in your code behind - the LoadOnDemand event handler of the RadTreeView.
In order to stop the animation, you have to set the IsLoadingOnDemand property to true like so:



private void radTreeView_LoadOnDemand(object sender, RadRoutedEventArgs e)

        {

            // get the treeview

            Telerik.Windows.Controls.RadTreeView tree = sender as Telerik.Windows.Controls.RadTreeView;

            // get the clicked Item

            RadTreeViewItem clickedItem = e.OriginalSource as RadTreeViewItem;

            // add the new items

            RadTreeViewItem newItem = new RadTreeViewItem()

            {

                Header = "New Item"

            };

            clickedItem.Items.Add(newItem);

            //System.Threading.Thread.Sleep(2000);

            clickedItem.IsLoadingOnDemand = false;

  

        }

Please let us know if this helps you or not. You can also provide a sample demosntrating your issue s that we could investigate in depth.

Regards,
Petar Mladenov
the Telerik team

[Alex]

I think you reply pointed me in the right direction! I marked it as an answer. I was setting isLoadingOnDemand to false, but I think there was a possibility in my code to skip that step. Should be sorted now though. thanks