Questions on UI for WinForms Forum

1 answer

12 views

Hi, I have a requirement to have multiple icons in a cell, I have created a custom GridViewDataColumn and a GridDataCellElement

My current implementation has 2 issues, the icons don't appear until you enter or leave a row (in which case only those rows icons get displayed), or when you click on the column (in which case all the visible rows display their icons.

The second issue is that, since I can scroll horizontally, when scrolling right, the cell locations that end up under the location of my icons cells, when you scroll left again, they appear empty, and you need to reload the Datasource or scroll multiple times vertically for them to appear again.

What I'm doing right now is overriding the ArrangeOverride, to locate the icons on the cell with Children[i].Arrange, and creating the icons overriding SetContent and OnCellFormatting and creating LightVisualElements there, calling Children.Clear() at the beginning of the methods.

I'll try to post an example later but has anyone had an issue like this before?

GridView

answered on 10 Mar 2026

1 answer

46 views

[Solved] Seeking Help: RadGridView Hierarchical CRUD Example with DataTable and SQLite

Hi everyone,
Requirement: Implement hierarchical (master-detail) add, delete, and edit functionality in RadGridView, with data flow: GridView ↔ DataTable ↔ SQLite Database.
Data Structure:
Master Table: MasterDataTable (e.g., Orders)
Detail Table: DetailDataTable (e.g., Order Items)
Relationship: One-to-many via foreign key
Tech Stack:
UI Control: Telerik RadGridView (WinForms)
Data Layer: DataTable + DataRelation
Database: SQLite
Core Requirements: Looking for a simple, complete example demonstrating:
1. Binding hierarchical data to RadGridView (master rows expandable to show details)
2. Two-way synchronization between UI edits and DataTable (inserts, updates, deletes)
3. Batch commit changes from DataTable back to SQLite database
Any guidance or code samples would be greatly appreciated!
Thanks in advance!

GridView

answered on 27 Feb 2026

1 answer

94 views

How to set RadRichTextEditor 's font and size at Design Time ?

Or

Using Customization's Theme ?

RichTextEditor

answered on 27 Feb 2026

1 answer

24 views

Disabled text color remains gray instead of black in RadDropDownList / RadDateTimePicker (Telerik 2015 Q1, TSSP attached)

Hi, Telerik Team.

I’m using Telerik UI for WinForms 2015 Q1 with a custom theme, and I want the text color to remain black even when the control is disabled. Currently, when Enabled=False, the text automatically becomes gray.

My goal is for the text color to be black in both Enabled and Disabled states.

This already works for RadTextBox, using the HostedTextBoxBase approach from the forum.

However, for the following controls, the text still becomes gray when disabled:

RadDropDownList
RadDateTimePicker

I already modified the Disabled state in Visual Style Builder and updated elements like RadDropDownTextBoxElement and TextBoxFill(Fill Primitive). I’ve attached my .tssp file.

Could you please review the .tssp and let me know if there is any incorrect setting, or if I’m modifying the wrong element to keep the disabled text color black?

Also, if there is a recommended way to achieve this without using Visual Style Builder (for example programmatically), I would appreciate your guidance.

Thank you.

Calendar, DateTimePicker, TimePicker and Clock

DropDownList

answered on 25 Feb 2026

8 answers

1.3K+ views

How to change the Selectedvalue

Hello,

i am using the version 2009.1.9.414. and have great problems with the RadMultiColumnComboBox.
I have a ComboBox bound to a DataTable and now i want to select a Row in the ComboBox. In all other
ComboBoxes i know i would just set the SelectedValue of the ComboBox. My expectation is that the
correct row is selected and the Text of the ComboBox show the value of the DisplayMember of the Selected Row.

When i set the SelectedValue in the Telerik RadMultiColumnComboBox i get the follwoing result.
The Cell which will be found by the current Selected Row and the valuemember will be changed by the passed SelectValue.

This seems to be a bug and not a feature or a user error. Is there any workaround or is it possible to get a patch.
It is urgent because i am using telerik in a huge Project and am at the beginning time enough to change to Componentart or
Infragistics. I want to continue with Telerik so please help me.

Best regards
Stefan

MultiColumn ComboBox

answered on 19 Feb 2026

1 answer

24 views

VISUAL Style Builder Seeting

i open "ControlDefault.tssp" using VSB

may i do something wrong

i can not seen others seeeting

how to reset to normal

Themes and Visual Style Builder

answered on 17 Feb 2026

1 answer

48 views

RadGridView Refresh

I have what seems like a simple task.

My grid looks like this:

and I create it by pulling the data and passing it to the SetupGrid() method (partially) shown below which creates the columns and sets the DataSource. This part works fine.

        private void SetupGrid(RadGridView grid,
                                List<Dictionary>? dictionaryList,
                                List<CreditInquirySetupEF>? efList,
                                List<CreditInquirySetupTU>? tuList)
        {
            grid.Columns.Clear();
            grid.Rows.Clear();
            grid.Templates.Clear();

            grid.MasterTemplate.AutoGenerateColumns = true;
            grid.MasterTemplate.ReadOnly = true;
            grid.MasterTemplate.ShowChildViewCaptions = false;
            grid.MasterTemplate.ShowRowHeaderColumn = false;

            grid.ShowRowHeaderColumn = false;
            grid.ShowChildViewCaptions = false;

            GridViewTemplate template1 = new GridViewTemplate();
            GridViewTemplate templateApp = new GridViewTemplate();

            if (efList is not null)
            {
                template1.AutoGenerateColumns = false;
                template1.DataSource = null;
                template1.DataSource = efList;
                template1.AllowAddNewRow = false;
                template1.ReadOnly = true;
                template1.ShowRowHeaderColumn = false;
                template1.Caption = string.Empty;

                grid.MasterTemplate.Templates.Add(template1);

                template1.MasterTemplate.ShowChildViewCaptions = false;

                GridViewRelation relation1 = new GridViewRelation(grid.MasterTemplate);
                relation1.ChildTemplate = template1;
                relation1.RelationName = "EQVendorID";
                relation1.ParentColumnNames.Add("DictionaryKey");
                relation1.ChildColumnNames.Add("VendorID");
                grid.Relations.Add(relation1);
            }

            if (tuList is not null)
            {
                templateApp.AutoGenerateColumns = false;
                templateApp.DataSource = null;
                templateApp.DataSource = tuList;
                templateApp.AllowAddNewRow = false;
                templateApp.ReadOnly = true;
                templateApp.ShowRowHeaderColumn = false;
                templateApp.ShowChildViewCaptions = false;
                grid.MasterTemplate.Templates.Add(templateApp);

                GridViewRelation relationApp = new GridViewRelation(grid.MasterTemplate);
                relationApp.ChildTemplate = templateApp;
                relationApp.RelationName = "TUVendorID";
                relationApp.ParentColumnNames.Add("DictionaryKey");
                relationApp.ChildColumnNames.Add("VendorID");
                grid.Relations.Add(relationApp);
            }

            grid.DataSource = null;
            grid.DataSource = dictionaryList;

            grid.MasterTemplate.Columns["BranchID"].IsVisible = false;
            grid.MasterTemplate.Columns["DictionaryID"].IsVisible = false;
            grid.MasterTemplate.Columns["DictionaryKey"].IsVisible = false;
            grid.MasterTemplate.Columns["DictionaryKeyString"].IsVisible = false;
            grid.MasterTemplate.Columns["DictionaryTypeID"].IsVisible = false;
            grid.MasterTemplate.Columns["Active"].IsVisible = false;

            grid.MasterTemplate.Columns["Description"].Width = 300;
            grid.MasterTemplate.Columns["Description"].HeaderText = "Bureau Name";
            grid.MasterTemplate.Columns["Description"].HeaderTextAlignment = ContentAlignment.MiddleLeft;

            var buttonCol = new GridViewImageColumn();

            buttonCol = new GridViewImageColumn();
            buttonCol.HeaderText = "";
            buttonCol.Name = "Propertys";
            buttonCol.HeaderImage = VisionUI.Properties.Resources.Plus_13;
            buttonCol.Width = 30;
            buttonCol.AllowSort = false;

            grid.MasterTemplate.Columns.Add(buttonCol);


            if (efList is not null)
            {
                grid.MasterTemplate.Templates[0].Caption = "";

                var column = new GridViewTextBoxColumn();

                column.FieldName = "VendorID";
                column.Name = "VendorID";
                column.IsVisible = false;
                grid.MasterTemplate.Templates[0].Columns.Add(column);


                column = new GridViewTextBoxColumn();

                column.FieldName = "SettingsBranchID";
                column.Name = "SettingsBranchID";
                column.IsVisible = false;
                grid.MasterTemplate.Templates[0].Columns.Add(column);


                column = new GridViewTextBoxColumn();

                column.FieldName = "ServiceName";
                column.Name = "ServiceName";
                column.Width = 145;
                column.HeaderText = "Service Name";
                column.HeaderTextAlignment = ContentAlignment.MiddleLeft;
                column.TextAlignment = ContentAlignment.MiddleLeft;
                column.IsVisible = true;
                grid.MasterTemplate.Templates[0].Columns.Add(column);

The problem comes when I delete a row in the subgrid and physically removing it from the db table. I tried removing the deleted entry from the collection and refreshing and even pulling the data from the database again like this:

               int settingsBranchID = absUIControls.GetGridValueInt(gvServiceNames, "SettingsBranchID");

               await creditInquirySetupEF.DeleteServiceNameAsync(settingsBranchID);
               await creditInquirySetupTU.DeleteServiceNameAsync(settingsBranchID);

               vendorList = CommonServices.GetDictionary(EDictionaryType.CreditInquiryVendor, creditInquirySetupEF.BranchID, false);

               creditInquirySetupEFList = await creditInquirySetupEF.GetCreditInquirySetupEFAsync(creditInquirySetupEF.BranchID);
               creditInquirySetupTUList = await creditInquirySetupTU.GetCreditInquirySetupTUAsync(creditInquirySetupTU.BranchID);

               gvServiceNames.DataSource = null;
               gvServiceNames.Templates[0].DataSource = null;
               gvServiceNames.Templates[1].DataSource = null;

               gvServiceNames.DataSource = vendorList;
               gvServiceNames.Templates[0].DataSource = creditInquirySetupEFList;
               gvServiceNames.Templates[1].DataSource = creditInquirySetupTUList;

               gvServiceNames.Refresh();
               gvServiceNames.Templates[0].Refresh();
               gvServiceNames.Templates[1].Refresh();


               foreach (var item in gvServiceNames.Rows)
               {
                   item.IsExpanded = true;
               }

               gvServiceNames.Templates[0].Rows[0].IsSelected = true;

When I reassign the datasources, for some reason the top grid formats like this:

Any ideas as to why?

Thanks

Carl

GridView

answered on 11 Feb 2026

1 answer

31 views

[Solved] Rad Pivot Grid for Windows Forms. Question about the sizing of the Columns

Hi Everyone.

I have tried to setup the Rad Pivot Grid Control. It works fine.. but one thing I can't get working is the sizing of the columns. How do I get the columns to fit the text inside it. As you can see in the picture attached the 'Binder Fee' is width is crazy wide for the value inside (example 123457.00).

I want to the bottom image's layout at the end of the day. The top one is too wide.

Thanks!

PivotGrid and PivotFieldList

answered on 05 Feb 2026

1 answer

47 views

Version Upgrade Issue

private void radGridView1_ContextMenuOpening(object sender, ContextMenuOpeningEventArgs e)
{
    var cellElement = e.ContextMenuProvider as GridCellElement;
    if (cellElement == null) return;
    if (cellElement is GridHeaderCellElement)
    {
      RadMenuItem exportExcel = new RadMenuItem($"ExportToExcel");
      exportExcel.Click += (s, args) => { ExportToExcel(); };
      e.ContextMenu.Items.Add(exportExcel);
    }
}
After upgrade to UI.for.WinForms.AllControls.Net80 <Version>2025.4.1321
cellElement is null in the above line 
then return 
i can not see "RadMenuItem($"ExportToExcel")"
WHY？

GridView

updated answer on 04 Feb 2026

1 answer

43 views

GridView Rows Selection

Hello.

I'm currently using VS2019, Telerik version 2021.3.914.40.

When I Shift-click and then MouseDown on a row in radGridView,

the last clicked RowIndex is internally saved.

When I Shift + MouseDown, the last clicked RowIndex is set as the StartIndex, and the last clicked RowIndex is set as the EndIndex.

I'd like to reset this internal RowIndex, which is saved by the last click.

Since GridView.ClearSelection() doesn't handle this code, I've attached the relevant project. Please check.

GridView

answered on 03 Feb 2026