Hello,

I have a question about the behavior of the Text property in the CellFormatting event in GridView. I understand that GridView uses UI virtualization, and that I need to reset all modified properties for the rest of cells. But how does the Text property behave? I looked through the forum and found this example:

private void radGridView1_CellFormatting(object sender, CellFormattingEventArgs e)
        {
            if (e.Column.Name == "Description")
            {
                e.CellElement.Text = e.CellElement.Value + " END";
                e.CellElement.Image = Properties.Resources.OutlookViewCalendar;
                e.CellElement.DrawImage = true;
                e.CellElement.TextImageRelation = TextImageRelation.TextBeforeImage;
            }
            else
            { 
                e.CellElement.ResetValue(LightVisualElement.ImageProperty, ValueResetFlags.Local);
                e.CellElement.ResetValue(LightVisualElement.DrawImageProperty, ValueResetFlags.Local);
                e.CellElement.ResetValue(LightVisualElement.TextImageRelationProperty, ValueResetFlags.Local);
            }
        }

In this example, all properties are reset except Text. When I tried to reset Text, all cell texts disappeared, except the ones I set manually in CellFormatting. So I think Text has special behavior in CellFormatting, and it's always set from Value at the beginning and it's not affected by UI virtualization and reusing cells. Is that correct?

Also, just to be sure, in all examples I saw the if/else pattern. But functionally, is it the same as if I reset all properties I want to change at the beginning, and then set them later? Or can this have some performance impact? The reason I ask is that I use a switch with more branches, and it would be hard to track what needs to be reset in each one.

Here is my case. And I was also thinking, in my case, is it correct to reset the properties before checking ColumnIndex and RowIndex, or after?

private void rgv_CellFormatting(object sender, CellFormattingEventArgs e)
		{
			e.CellElement.ResetValue(LightVisualElement.BackColorProperty, ValueResetFlags.Local);
			e.CellElement.ResetValue(LightVisualElement.NumberOfColorsProperty, ValueResetFlags.Local);
			e.CellElement.ResetValue(LightVisualElement.DrawFillProperty, ValueResetFlags.Local);
			e.CellElement.ResetValue(LightVisualElement.PaddingProperty, ValueResetFlags.Local);
			//e.CellElement.ResetValue(LightVisualElement.TextProperty, ValueResetFlags.Local);

			if ((e.ColumnIndex < 0) || (e.RowIndex < 0))
				return;

			var ed = e.Row.DataBoundItem as TestParEditorItem;
			if (ed == null)
				return;

			bool isSub = ed.IsSubItem;
			bool hasSub = ed.HasSubItems;

			switch (e.Column.Name)
			{
				case "colR":
				case "colFi":
				case "colR2":
				case "colFi2":
					if (isSub)
						e.CellElement.Text = "";
					break;

				case "colMin":
				case "colMax":
					if (hasSub)
						e.CellElement.Text = "";
					break;

				case "colAct":
					e.CellElement.BackColor = SystemColors.ControlLight;
					e.CellElement.NumberOfColors = 1;
					e.CellElement.DrawFill = true;
					break;

				case "colType":
					if (isSub)
					{
						e.CellElement.Text = ed.SubItemName;
						e.CellElement.Padding = new Padding(30, 0, 0, 0);
					}
					else
					{
						e.CellElement.Padding = new Padding(0, 0, 0, 0);
					}
					break;
			}
		}

Thanks.

i use VS2022  .net8

i create a new project to try RadTreeView 

ptoject file as attached

but

1. The Text of Form shown on the VS2022 IDE is so small

2. At Run Time  i can not see anything  in the RadTreeView  

can anyone help me

thanks a lot

1.  i install    Telerik UI for WinForm  using Telerik_UI_For_WinForms_2025_4_1111.msi 

2. i can use create Telerik Winform Project and can download License Key to my PC using VS2026

3. But i can not see Telerik Compoment in ToolBox and somethingwrong in the new Telerik Winform Project 

J'ai 2 toolwindows.
J'ai une toolwindows 'filtre'. c'est pour la gestion des filtres. Elle se trouve à gauche
J'ai une toolwindows 'Aide'. C'est pour la gérer une aide. Elle se trouve à droite.
Je veux interdire la toolwindows 'filtre' d'être flotante. Elle doit toujours être à gauche.
Comment peut-on faire.
Merci

Thank's

Laurent.

Hi.

I'm facing and issue with displaying hierarchical data (self-referencing) in grid when missing parent items in data source - only part of data is displayed.

1. Add grid to form

2. Setup self-referencing

3. Create dummy data type

4. Add new data source

And as expected a correct tree structure is displayed

However in my case due to busines logic I have only a subset of data - all except item "1" and "2".

Instead of ex

I can see only children of first missing parent item. Although the number of rows is matching correct total number of item to be displayed (5) only part of items are visible (3).

As a workaroud I can modify data source and remove parent assignement from objects if parent is missing in data source either on data preparation or DataBindingComplete event.

However this solution is not suitable, because it is modifying data providing inconsistant state - using that data in code I may falsly assume that the item does not have a parent while it has.

Any ideas how to solve this issue?

Regargs
Greg

Hi,

I was previously developing with Telerik UI for WinForms 2025 Q3. Recently, I installed the latest version (2025 Q4) using the MSI installer and then manually updated the NuGet packages in my project to complete the upgrade without using the Update Wizard. Everything works fine now.

However, every time I open the project in Visual Studio, I still see the notification:

"You are using an older version of Telerik UI for WinForms for this project. There is a new version available for this computer. Update Now"

Is there a way to disable or hide this notification after manually updating the NuGet packages?

Thanks in advance!

¡Hi everyone! Is there a possibility to have a RadContexMenu with rounded corners ?
I already change the styles via theme, but when I open the context menu, it has some white square corners behind.

The version I have right now is 2016 SP1

Our application doesn't explicitly set a default theme so it defaults to ControlDefault.
One screen uses the MaterialBlueGrey theme, so I wanted the related MessageBoxes to also use that theme.

Per the instructions I used the following code:

RadMessageBox.SetThemeName("MaterialBlueGrey");
RadMessageBox.Show("MESSAGE");
RadMessageBox.SetThemeName("ControlDefault");

The problem is that, although the overall look goes back to the default theme, some elements stay with the MaterialBlueGrey theme. For example: the button height & caption font.

I tried all these with the same result:

RadMessageBox.SetThemeName("");
RadMessageBox.ThemeName = "";
RadMessageBox.ThemeName = "ControlDefault";