I have a situation where I have code that executes when the Selected Node  is changed.

SelectedNodeChanged

The code in the SelectedNodeChange adds controls to some FlowLayoutPanel.

When a user clicks on a node, you can see the controls being added to the control

but the RadTreeView allows the user to select another node eventhough the SelectedNodeChange event has not finished, which

is now causing issues with the FlowLayoutPanelshowing duplicate controls.

If user waits until all controls are in the FlowLayoutPanel, and then selects another node, everything works as expected.

None of the code that adds the controls to the FlowLayoutPanel are Asynchronous.

I DO NOT have Multiselect = true.

** I have noticed that the RadTreeView acts as though it is Asynchronous when filling it.  I have code that fills the nodes and you can select the nodes and see the nodes being added behind the scenes. 

Maybe control is Asynchronous when changing selected nodes?

WinForms TreeView displays icons and text. How to obtain the Rectangle of the icon area, or how to implement the click event of the icon. Through the method in https://www.telerik.com/forums/hovering-over-node-image: 
TreeNodeImageElement imageElement = radTreeView1.ElementTree.GetElementAtPoint(e.Location) as TreeNodeImageElement;
The obtained structure is null, and the version is 2025.

thaks

We have been using the TreeView in our software for some time now. However, recently, we noticed that it's not behaving as we have coded it. We had code that changed the Forcolor and Font when a node was selected. However, this doesn't seem to be working anymore. Attached is a sample code. Any help would be greatly appreciated.

FYI, we are using Telerik for Winforms: 2024.3.924.462

TIA

using System;
using System.Collections.Generic;
using System.Drawing;
using Telerik.WinControls;
using Telerik.WinControls.UI;

namespace TestNodeColorChange
{
   public partial class RadForm1 : Telerik.WinControls.UI.RadForm
   {
      #region Private Fields

      private string selectedNodeKey = string.Empty;

      #endregion Private Fields

      #region Public Constructors

      public RadForm1()
      {
         InitializeComponent();
         Load += FormLoading;
      }

      #endregion Public Constructors

      #region Private Methods

      private void FormLoading(object sender, EventArgs e)
      {
         List<TreeViewData> list = new List<TreeViewData>()
         {
            new TreeViewData { key = 1, DisplayValue = "Level 1" },
            new TreeViewData { key = 2, parentKey = 1, DisplayValue = "Branch A" },
            new TreeViewData { key = 3, parentKey = 1, DisplayValue = "Branch B" },
            new TreeViewData { key = 4, parentKey = 1, DisplayValue = "Branch C" }
         };

         radTreeView1.ChildMember = "key";
         radTreeView1.DisplayMember = "DisplayValue";
         radTreeView1.ParentMember = "parentKey";
         radTreeView1.DataSource = list;

         radTreeView1.ExpandAll();

         radTreeView1.SelectedNodeChanged += SelectedNodeChanged;
         radTreeView1.NodeFormatting += NodeFormatting;
      }

      private void NodeFormatting(object sender, TreeNodeFormattingEventArgs e)
      {
         if (e.NodeElement is LightVisualElement lve)
         {
            lve.ResetValue(VisualElement.ForeColorProperty, ValueResetFlags.Local);
            lve.ResetValue(VisualElement.FontProperty, ValueResetFlags.Local);

            if (e.Node.Value.ToString() == selectedNodeKey)
            {
               lve.Font = new Font(lve.Font.FontFamily, lve.Font.Size, FontStyle.Bold);
               lve.ForeColor = Color.Purple;
               radTreeView1.NodeFormatting -= NodeFormatting;
               radTreeView1.Refresh();
               radTreeView1.NodeFormatting += NodeFormatting;
               Console.WriteLine("NodeFormatting: " + selectedNodeKey);
               Console.WriteLine("NodeFormatting: " + e.NodeElement.ForeColor.ToString());
               Console.WriteLine("NodeFormatting: " + ((e.NodeElement.Font.Style & FontStyle.Bold) != 0));
            }
         }
      }

      private void SelectedNodeChanged(object sender, RadTreeViewEventArgs e)
      {
         selectedNodeKey = e.Node.Value.ToString();
         Console.WriteLine("SelectedNodeChanged: " + selectedNodeKey);
         radTreeView1.Nodes.Refresh();
      }

      #endregion Private Methods

      #region Internal Classes

      internal class TreeViewData
      {
         #region Public Properties

         public string DisplayValue { get; set; }
         public int key { get; set; }
         public int? parentKey { get; set; }

         #endregion Public Properties
      }

      #endregion Internal Classes
   }
}

Hello,

is there any alternate available to apply specific theme directly on win form controls other than making a change in stylesheet (to apply different colors and appearance?) basically, for specific theme user wants to apply different color. one option is to create .tsp file and add it to resource. so is there any other way possible where user don't need to create. tsp or any other file and by using direct property he can achieve the same.  (controls like date time picker, calendar, tree view, Rad buttons etc.)

Thank you.

Hi,

Is it possible to override the colour and width of the horizontal drag / drop visual cue? If so can you give me an example ?

Cheers

Toby

Hello Team

How to set horizontal scroll position left most in the RadTreeView ?

Note: telerik version 2024.1.312.48

Attached screenshot for reference:

Thanks

Rajkannan

Hello,

We have a RadTreeView control inside a ToolWindow (with Dock = Fill) in a RadDock control. The nodes are added to the tree programmatically and AllowArbitraryItemHeight=false and TreeViewElement.AutoSizeItems=true. There is no ItemHeight set at all. We are sporadically getting an issue where the RadTreeView won’t let the user scroll to the bottom of the tree. We can’t consistently reproduce this error however. Is there any advice you can give how to try figure out what is going on?

Thanks,

Hayley