Doesn't Refresh

[David]

Hello i was developed a TreeView. When i insert a node from constructor do it perfectly, but if i call the "addNode" from other function, nothing appear.

My xaml code is:
<Grid x:Name="LayoutRoot" Background="White">
        <telerik:RadTreeView x:Name="uxtTreeView_Model" />
    </Grid>

All is code behind.

If i call the addNode from the constructor or add de node directly works but call from other class doesn't work

By example this:
  public void addRootNode()
        {
            RadTreeViewItem itemRaiz = new RadTreeViewItem();
            itemRaiz.Name = "<root>";
            itemRaiz.Header = "<No Elements>";
            uxtTreeView_Model.Items.Add(itemRaiz);
        }

Call from constructor works, but if i do a instation of the this class and call the function, does not work

[Hristo]

Hello,

The issue you are describing sounds really strange. I wasn't able to simulate it, thus attached a sample project showing my attempt.

Could you please modify my project in order to introduce the issue?

Greetings,
Hristo
the Telerik team

[David]

Hello. Thanks for the answer. 

In your example all code are in the main file, the problem is if you want have code in another usercontrol in a different xaml file, using a xmlns:local, by example.

Code of main.xaml:

<UserControl x:Class="EjTreeTelerik.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:local="clr-namespace:EjTreeTelerik"
    mc:Ignorable="d"
    d:DesignHeight="300" d:DesignWidth="400">


    <Grid x:Name="LayoutRoot" Background="White">
        <local:customArbol x:Name="cArbol"></local:customArbol>


    </Grid>
</UserControl>

code of main.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using Telerik.Windows.Controls;


namespace EjTreeTelerik
{
    public partial class MainPage : UserControl
    {
        public MainPage()
        {
            InitializeComponent();
            cargaElementosArbol();
        }


        private void cargaElementosArbol()
        {
            customArbol c = new customArbol();
            c.carga();
            LayoutRoot.DataContext = c;          
          
        }
    }
}

Now we have the telerik component:

customArbol.xaml (arbol in Tree in spanish )

<UserControl x:Class="EjTreeTelerik.customArbol"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d"
              xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation"
    d:DesignHeight="300" d:DesignWidth="400">
    
    <Grid x:Name="LayoutRoot" Background="White">
        <telerik:RadPaneGroup>
            <!--Arbol del proyecto-->
            <telerik:RadPane Header="Model Explorer">
                <!-- 
                        <customControls:ctlTreeModel></customControls:ctlTreeModel>
                    -->
                <telerik:RadTreeView x:Name="uxtTreeView_Model" />


            </telerik:RadPane>
        </telerik:RadPaneGroup>
    </Grid>
</UserControl>

Code of customArbol.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using Telerik.Windows.Controls;


namespace EjTreeTelerik
{
    public partial class customArbol : UserControl
    {
        public customArbol()
        {
            InitializeComponent();           
        }


        public void carga()
        {
            RadTreeViewItem itemRaiz = new RadTreeViewItem();
            itemRaiz.Name = "<root>";
            itemRaiz.Header = "Acabamos de invocar la funcion";
            uxtTreeView_Model.Items.Add(itemRaiz);
        }
    }
}

[Tina Stancheva]

Hello David,

Thank you for sending your sample code. However, there is one part of it that I can't understand. I noticed that once you create the new customArbol control, you're setting it as a DataContext of the LayoutRoot control. Can you please shed some light on why you've set the RadTreeView as a DataContext of the LayoutRoot element?

Also I created a sample solution based on your code snippets and I only changed the DataContext logic by placing the new customArbol control in the Children collection of the LayoutRoot:

private void cargaElementosArbol()
{
    customArbol c = new customArbol();
    c.carga();
    //LayoutRoot.DataContext = c;
    LayoutRoot.Children.Add(c);
}

 and it worked as expected. However, please let me know if I'm missing something.

Regards,
Tina Stancheva
the Telerik team