Questions on UI for WinForms Forum

1 answer

75 views

How to change the font color in RadRibbonBarGroup (WinForms) with code?

I searched and searched and this answer was answered back in 2023 but not from a code perspective.

How do I change the font fore color (via code) for the group caption? CaptionFill is for the backcolor. Got it. I have spent hours trying to find it in this website and searching. Why does Telerik make things so difficult?

RibbonBar

answered on 22 Jan 2026

4 answers

175 views

Datagridview - Column chooser

Hello,

I want to choose column by checkboxes, something like that:

I

It is possible?

Thank you for your answer

CheckedListBox

GridView

answered on 22 Jan 2026

1 answer

76 views

How to disable some default Column Header Context Menu ?

i want to disable some default Column Header Context Menu like "Sort Ascdnging" "Sort Descending" ...

How to do ?

Also i want to disable some default Cell Column Context Menu ? TKS

GridView

answered on 20 Jan 2026

1 answer

91 views

Make a row of RADGRIDVIEW as "Deleted"

i use RADGRIDVIEW to show datas

i want to let use to select some rows as "Deleted"

to delete these datas form DataBase

how can i let these rows shown as the following

the example is done by using C# default DataGridView

How can be done in RADGRIDIEW ?

GridView

answered on 20 Jan 2026

1 answer

130 views

GridView cell formatting in custom columns

Hello,

I would like to ask two questions about custom columns in GridView. I'm putting them into one thread since they're related.

1. What's the relationship between SetContentCore and OnCellFormatting? Is it ok to set formatting in SetContentCore? This is how it seems to me to be correct:

		protected override void SetContentCore(object value)
		{
			if (value is Quality q)
			{
				if (q == Quality.None)
					Text = "--";
				else
					Text = q.ToString();
			}
			else
				base.SetContentCore(value);
		}

		protected override void OnCellFormatting(CellFormattingEventArgs e)
		{
			ResetValue(VisualElement.BackColorProperty, ValueResetFlags.Local);
			ResetValue(VisualElement.ForeColorProperty, ValueResetFlags.Local);
			ResetValue(LightVisualElement.NumberOfColorsProperty, ValueResetFlags.Local);
			ResetValue(LightVisualElement.DrawFillProperty, ValueResetFlags.Local);

			if (Value is Quality q)
			{
				switch (q)
				{
					case Quality.OK:
						BackColor = Color.Lime;
						NumberOfColors = 1;
						DrawFill = true;
						break;
					case Quality.NOK:
						BackColor = Color.Red;
						NumberOfColors = 1;
						DrawFill = true;
						break;
					case Quality.Error:
						BackColor = Color.DodgerBlue;
						NumberOfColors = 1;
						DrawFill = true;
						break;
				}
			}

			base.OnCellFormatting(e);
		}

But this also works. I tried it mainly because of the second question, and Copilot actually suggested it as the first styling approach.

		protected override void SetContentCore(object value)
		{
			if (value is Quality q)
			{
				if (q == Quality.None)
					Text = "--";
				else
					Text = q.ToString();

				ResetValue(VisualElement.BackColorProperty, ValueResetFlags.Local);
				ResetValue(VisualElement.ForeColorProperty, ValueResetFlags.Local);
				ResetValue(LightVisualElement.NumberOfColorsProperty, ValueResetFlags.Local);
				ResetValue(LightVisualElement.DrawFillProperty, ValueResetFlags.Local);

				switch (q)
				{
					case Quality.OK:
						BackColor = Color.Lime;
						NumberOfColors = 1;
						DrawFill = true;
						break;
					case Quality.NOK:
						BackColor = Color.Red;
						NumberOfColors = 1;
						DrawFill = true;
						break;
					case Quality.Error:
						BackColor = Color.DodgerBlue;
						NumberOfColors = 1;
						DrawFill = true;
						break;
				}
			}
			else
				base.SetContentCore(value);
		}

2. Is there any way to override how Value is retrieved from the DataBoundItem? In one of my column types, I can't use FieldName directly. In classic DataGridView, I could override GetValue / SetValue like this:

		protected override object GetValue(int rowIndex)
		{
			DgvRealResultColumn col = OwningColumn as DgvRealResultColumn;
			object obj = DataGridView.Rows[rowIndex].DataBoundItem;
			if ((col == null) || (obj == null))
				return base.GetValue(rowIndex);

			object resultValue = GetResultValue(rowIndex, col, obj);
			Quality q = (Quality)Convert.ToInt32(resultValue);
			if (!QualityHelper.HasValue(q))
				return null;

			if (obj is RealResult rr)
				return rr.Value;

			string propName = string.Format("R{0:D3}Value", col.ItemIndex);
			PropertyInfo pi = obj.GetType().GetProperty(propName);
			return pi.GetValue(obj, null);
		}

I don't see anything like that in Telerik GridView. So far, I came up with this workaround:

		protected override void SetContentCore(object value)
		{
			TestResult r = null;
			var obj = RowInfo.DataBoundItem;
			if (obj is TestResult)
				r = (TestResult)obj;
			else if (obj is TestItem item)
			{
				var col = ColumnInfo as RgvTestResultColumn;
				if ((col != null) && (item.Results != null) && (col.ResultIndex < item.Results.Length))
					r = item.Results[col.ResultIndex];
			}

			ResetValue(VisualElement.BackColorProperty, ValueResetFlags.Local);
			ResetValue(VisualElement.ForeColorProperty, ValueResetFlags.Local);
			ResetValue(LightVisualElement.NumberOfColorsProperty, ValueResetFlags.Local);
			ResetValue(LightVisualElement.DrawFillProperty, ValueResetFlags.Local);

			if (r == null)
			{
				base.SetContentCore(value);
				return;
			}

			switch (r.Result)
			{
				case Quality.OK:
					Text = r.Value.ToString("F1");
					BackColor = Color.Lime;
					NumberOfColors = 1;
					DrawFill = true;
					break;
				case Quality.NOK:
					Text = r.Value.ToString("F1");
					BackColor = Color.Red;
					NumberOfColors = 1;
					DrawFill = true;
					break;
				case Quality.Error:
					Text = "X";
					BackColor = Color.DodgerBlue;
					NumberOfColors = 1;
					DrawFill = true;
					break;
				default:
					Text = "--";
					break;
			}
		}

But in this case, it doesn't set the internal Value, so when I write rgv.Rows[0].Cells["colR0"].Value in code, I always get null. Is there any way to solve this? I am attaching my test code for testing.

GridView

answered on 01 Jan 2026

1 answer

276 views

How to custimize RadMessageBox ?

i want to custimize RadMessageBox

example : set the TitleBar.Font BackColor

set radLabel1 font and backcolor

set button 's font and button's szie ....

MessageBox

answered on 30 Dec 2025

2 answers

162 views

RadMenuItem's TEXT shown too small ? how can i fix it ?

GridView

answered on 26 Dec 2025

1 answer

186 views

Rounded RadForm in Winform

Hello, I want to create a rounded form.

I want to convert existing forms created using RadForm into rounded forms.

I want to create a BaseRoundedForm that inherits from RadForm.

Is there a way to do this?

I'm using C#.

Since ShapedForm inherits from Form, it may be difficult to apply it to existing RadForm forms.

Form

ShapedForm

answered on 23 Dec 2025

2 answers

127 views

RadPageView DragDrop - copy Row from RadPageView to System.Windows.Forms.DataGridView

Hello,

I’m working with some older forms that use System.Windows.Forms.DataGridView. The form is quite complex, so converting it to Telerik isn’t straightforward.

I’d like to copy a row from RadPageView. Could you please provide a sample code snippet showing how to achieve this?

Thank you!

Radek

GridView

answered on 17 Dec 2025

1 answer

101 views

Window RadTreeView c# - Remove mouse over back ground highlight on nodes

Hi All,

I searched on internet for the solution but didn't find any solution. I am using RadTreeView control, when I move mouse over treeview, nodes get highlighted. I used following ways but no luck.

private void radTreeList_NodeMouseMove(object sender, RadTreeViewMouseEventArgs e)
{
e.Node.BackColor = Color.Transparent; // Remove hover background
}

private void radTreeList_NodeFormatting(object sender, TreeNodeFormattingEventArgs e)
{
e.NodeElement.BackColor = Color.Transparent; // Remove hover background
e.NodeElement.DrawFill = false; // Disable fill

if (e.Node.Selected)
{
e.Node.BackColor = Color.Blue; // Default background
e.Node.ForeColor = Color.White; // Default text color
}
else
{
e.NodeElement.ContentElement.ResetValue(LightVisualElement.BackColorProperty, ValueResetFlags.Local);
e.NodeElement.ContentElement.ResetValue(LightVisualElement.ForeColorProperty, ValueResetFlags.Local);
}
}

Kindly provide me solution, stuck on this for a long time.

Thanks

Treeview

answered on 17 Dec 2025