GridViewSelectColumn seems to be very slow when selecting a very large list of items. From the looks of it, it appears to be issuing a property changed notification for each item individually.

Is there a way to speed it up?

I read examples from docs.telerik.com, downloaded demos but they're often so long and i can not know what i need in them. 

I only need make an item of a list to parent items in code behind. Do i need HierarchicalDataTemplate or RadTreeViewItem ?

_______ my code _______

public static HttpClient client = new HttpClient() ;
private void _ProductList()
{
      var url = "api/Products/";
      HttpResponseMessage response = client.GetAsync(url).Result;

      if (response.IsSuccessStatusCode)
      {
         var x = response.Content.ReadAsAsync<List<Product>>().Result;
         Product allprod = new Product();
         allprod.ProdID = 0;
         allprod.Name = " All Products";

        x.Add(allprod);
        myTreeView.ItemsSource = x;
        myTreeView.DisplayMemberPath = "Name";
        myTreeView.SelectedValuePath = "ProdID";
        // ....
     }
     else
     {
        MessageBox.Show("Error Code " + response.StatusCode +
                    " : Message - " + response.ReasonPhrase);
     }
}

__________

I tried RadTreeViewItem, but it doesn't have SelectedValuePath property.

- Items show Name and selected value is its ProdID 
And it seems difficult to use HierarchicalDataTemplate in code behind (with me).

- With my code, i have "prod.png" and i need "need.png" 

It's the best if you can edit code to me, please. Thank you.

__________

At last, i think demos (not only treeview) need a version classic-demo which is the most simple (except styles) with small data.
Example "First look" is really a big demo.

Hello,

I just ported my solution from .NET 3.5 to .NET 4.6.1 and updated Telerik from version 2012.2.912.35 to 2015.3.1104.5.

This code used to work fine, the setter of the property was called when the control lost focus:

After the framework and Telerik was updated, the setter was never called anymore. To go back to how it used to work, I had to add UpdateSourceTrigger=LostFocus and UpdateValueEvent="PropertyChanged":

Could you tell me what changed in between versions?

Thanks in advance

Hi,

I have problems when drag dropping inherited appointments from RadListBox to RadScheduleView. When the inherited class ProtocolChildAppointment (as below) is dropped from radListBox to scheduleview its a ProtocolAppointment class not the intented inherited class. I have tried to override Drop-function without success. Everything looks like its dropping a ProtocolChildAppointment  in the ConvertTo, ConvertDraggedData and Drop -functions.

public class ProtocolAppointment : Appointment
{
    public ProtocolAppointment()
        : base()
    {
    }
    // code...
    public override IAppointment Copy()
    {
        var newAppointment = new ProtocolAppointment();
        newAppointment.CopyFrom(this);
        return newAppointment;
    }
}

public class ProtocolChildAppointment : ProtocolAppointment
{
    public ProtocolChildAppointment()
        : base()
    {
    }
    //code...
    public override IAppointment Copy()
    {
        var newAppointment = new ProtocolChildAppointment();
        newAppointment.CopyFrom(this);
        return newAppointment;
    }
}

class ProtocolScheduleViewDragDropBehavior : Telerik.Windows.Controls.ScheduleViewDragDropBehavior
{
    public override IEnumerable<IOccurrence> ConvertDraggedData(object data)
    {
        if (DataObjectHelper.GetDataPresent(data, typeof(ProtocolAppointment), true))
        {
            return ((IEnumerable)DataObjectHelper.GetData(data, typeof(ProtocolAppointment), true)).OfType<IOccurrence>();
        }
        return base.ConvertDraggedData(data);
    }

    public override void Drop(Telerik.Windows.Controls.DragDropState state)
    {
        // here all stil looks like its dropping ProtocolChildAppointment
        base.Drop(state);
    }

}

class ProtocolAppointmentConverter : DataConverter
{
    public override string[] GetConvertToFormats()
    {
        return new string[] { typeof(PetErpUIClient.ProtocolAppointment).AssemblyQualifiedName };
    }

    public override object ConvertTo(object data, string format)
    {
        if (DataObjectHelper.GetDataPresent(data, typeof(ProtocolAppointment), false))
        {
            var payload = (IEnumerable)DataObjectHelper.GetData(data, typeof(ProtocolAppointment), false);
            if (payload != null)
            {
                List<PetErpUIClient.ProtocolAppointment> apps = new List<PetErpUIClient.ProtocolAppointment>();
                apps.AddRange(payload.OfType<PetErpUIClient.ProtocolAppointment>());
                return apps;
            }
        }
        return null;
    }
}

Hi,

I am using RadListBox with ContextMenu  for an item,

on every right click (only on an item) i need

1. that the menu will be open only on the item (when i am clicking on free space on the list area, i don't want that the menu will open)

2. get the selected item to my viewModel

this is my code:

<telerik:RadListBox

           ItemSource ="{Binding collection}" , SelectedItem="{Binding Selected2, mode =TwoWay}">

 <teletik:RadContextMenu.ContextMenu>

       <teletik:RadContextMenu>

          <telerik:RadMenuItem Header="This menu is only for item" command="{Binding c}" CommandParamter="{Binding=selectedItem}"/>

   </teletik:RadContextMenu.ContextMenu>
 </teletik:RadContextMenu>