Questions on UI for WinForms Forum

1 answer

66 views

Filter Row Height

I looked around the forum and I cannot find anything relating to the Filter Row Height

When I type in the filter row field the text is unreadable

When I click off of the field you'll notice from the images that I typed a T... but it hardly visible in the initial image

How do I adjust the height of the Filter row so that when the user types - they can see what they are typing???

GridView

answered on 21 Jul 2026

1 answer

61 views

[Solved] No Column Header Text but Text in the Column Chooser

I have a grid where I have some very narrow columns where I might use an icon in the header or simply leave the header text blank. However, it would be nice to be able to have something go into the Column Chooser text rather than simply use the HeaderText in there so the user knows what the column is when they are looking at the list. Is this possible at all please?

Thank you in advance.

Simon

GridView

answered on 21 Jul 2026

1 answer

26 views

Managing the number of items displayed in a RadSplitButtonElement

Hello,
I am using a RadSplitButtonElement:
DEFINE PRIVATE VARIABLE BtnAnnulerSplit AS Telerik.WinControls.UI.RadSplitButtonElement NO-UNDO.

and I would like to control the number of items displayed. If there are more than can fit, display a vertical scrollbar; otherwise, do not.
I have written the following code:

DEFINE VARIABLE oMenu AS Telerik.WinControls.UI.RadDropDownMenu NO-UNDO.
DEFINE VARIABLE iItemHeight AS INTEGER NO-UNDO.
oMenu = BtnAnnulerSplit:DropDownMenu.
iItemHeight = 10.

oMenu:Maximum = NEW System.Drawing.Size(0, 20 * iItemHeight).

I do have a size, but no vertical scrollbar, which means I can’t see all the items.
Thank you for your feedback
Translated with DeepL.com (free version)

Buttons, RadioButton, CheckBox, etc

answered on 20 Jul 2026

1 answer

43 views

GridView Filtering Issue in latest release

I had to revert back to 2026.2.520 because of the issues with 026.2.702

The dropdown is broken and I can't release a new build of apps to customers

And now, I found issues with gridview filtering that has worked forever in all previous builds.

After reverting back to 520 these two line work properly again.

So, I'm just writing to let you know that you should look into the next build after 702 to ensure that the 2 lines below function.

Basically, I created a usercontrol and dropped the grid onto the control.

But when I tried to drop the user control onto a form - it threw a error box and wouldn't allow the control to be dropped on the form.

Using trial and error I found that by REMing out 1 or both of the 2 lines below the Usercontrol could be dropped onto the form again.

.MasterTemplate.EnableFiltering = True

.MasterTemplate.DataView.BypassFilter = False

Here is the full routine that I use to clean up the GridView in most instances.

   Friend Sub GridInitializeGridProperties(ByVal oRadGridView As Telerik.WinControls.UI.RadGridView, ByVal Optional EnableFiltering As Boolean = True, ByVal Optional EnableExcelFiltering As Boolean = True)
       Try
           With oRadGridView
               .AutoSizeRows = True
               .TableElement.SearchHighlightColor = Color.Orange
               .Dock = DockStyle.Fill
               .ReadOnly = True
               .AllowAddNewRow = False
               .AllowDeleteRow = False
               .AllowEditRow = False
               .AutoScroll = True
               .EnableFastScrolling = True
               .SelectionMode = GridViewSelectionMode.FullRowSelect
               .AutoSizeColumnsMode = GridViewAutoSizeColumnsMode.Fill
               .ShowNoDataText = False
               .EnableAnalytics = False
               .MasterTemplate.BestFitColumns()
               .EnableAlternatingRowColor = True
               .EnableGrouping = False
               .AllowDragToGroup = False
               If EnableFiltering Then
                   .EnableFiltering = True
                   .ShowFilteringRow = True
                   .MasterTemplate.EnableFiltering = True
                   .MasterTemplate.DataView.BypassFilter = False
               End If
               If EnableExcelFiltering Then
                   .ShowHeaderCellButtons = True
               End If
           End With
       Catch ex As Exception
       End Try
   End Sub

I'm not concerned about it just now because I reverted back to the previous release - but something more than just the dropdown combos seems to be amiss.

GridView

answered on 20 Jul 2026

1 answer

46 views

Tertiary layer on RadGridView

I built a grid that has three levels as per the code below and I get this UI:

There should be data under the Card and Other/Basic rows but it doesn't show. I've done this successfully with other grids but something seems to be missing in this case.

The top level data looks like this:

The second level looks like this:

and the 3rd layer data looks like this:

private void SetupGrid(RadGridView grid,
                        List<ACHElectronicPayments>? achData)
{
    grid.MasterTemplate.AutoGenerateColumns = true;
    grid.MasterTemplate.ReadOnly = true;

    var achTypeData = achData
        .GroupBy(p => p.Type)
        .Select(group => new
        {
            Type = group.Key,
            AmountCollected = group.Sum(n => n.AmountCollected),
            ReturnAmount = group.Sum(n => n.ReturnAmount),
            Deposit = group.Sum(n => n.Deposit)
        });

        GridViewTemplate template2 = new GridViewTemplate();
        template2.AutoGenerateColumns = true;
        template2.DataSource = achData;
        template2.AllowAddNewRow = false;
        template2.ReadOnly = true;
        template1.Templates.Add(template2);

        GridViewRelation relation2 = new GridViewRelation(template1);
        relation2.ChildTemplate = template2;
        relation2.RelationName = "TypeDCType";
        relation2.ParentColumnNames.Add("Type");
        //relation2.ParentColumnNames.Add("DCType");
        relation2.ChildColumnNames.Add("Type");
        //relation2.ChildColumnNames.Add("DCType");
        grid.Relations.Add(relation2);
    }

    grid.DataSource = achTypeData;

    grid.MasterTemplate.Columns["Type"].Width = 100;
    grid.MasterTemplate.Columns["Type"].HeaderText = "Type";
    grid.MasterTemplate.Columns["Type"].HeaderTextAlignment = ContentAlignment.MiddleLeft;

    grid.MasterTemplate.Columns["AmountCollected"].Width = 100;
    grid.MasterTemplate.Columns["AmountCollected"].HeaderText = "Amount Collected";
    grid.MasterTemplate.Columns["AmountCollected"].HeaderTextAlignment = ContentAlignment.MiddleRight;
    grid.MasterTemplate.Columns["AmountCollected"].FormatString = "{0:#,##0.00}";

    grid.MasterTemplate.Columns["ReturnAmount"].Width = 80;
    grid.MasterTemplate.Columns["ReturnAmount"].HeaderText = "Return Amount";
    grid.MasterTemplate.Columns["ReturnAmount"].HeaderTextAlignment = ContentAlignment.MiddleRight;
    grid.MasterTemplate.Columns["ReturnAmount"].FormatString = "{0:#,##0.00}";

    grid.MasterTemplate.Columns["Deposit"].Width = 90;
    grid.MasterTemplate.Columns["Deposit"].HeaderText = "Deposit";
    grid.MasterTemplate.Columns["Deposit"].HeaderTextAlignment = ContentAlignment.MiddleRight;
    grid.MasterTemplate.Columns["Deposit"].FormatString = "{0:#,##0.00}";



    grid.MasterTemplate.Templates[0].Columns["Type"].IsVisible = false;

    grid.MasterTemplate.Templates[0].Columns["DCType"].Width = 120;
    grid.MasterTemplate.Templates[0].Columns["DCType"].HeaderText = string.Empty;
    grid.MasterTemplate.Templates[0].Columns["DCType"].HeaderTextAlignment = ContentAlignment.MiddleLeft;

    grid.MasterTemplate.Templates[0].Columns["AmountCollected"].Width = 100;
    grid.MasterTemplate.Templates[0].Columns["AmountCollected"].HeaderText = string.Empty;
    grid.MasterTemplate.Templates[0].Columns["AmountCollected"].FormatString = "{0:#,##0.00}";

    grid.MasterTemplate.Templates[0].Columns["ReturnAmount"].Width = 120;
    grid.MasterTemplate.Templates[0].Columns["ReturnAmount"].HeaderText = string.Empty;
    grid.MasterTemplate.Templates[0].Columns["ReturnAmount"].FormatString = "{0:#,##0.00}";

    grid.MasterTemplate.Templates[0].Columns["Deposit"].Width = 120;
    grid.MasterTemplate.Templates[0].Columns["Deposit"].HeaderText = string.Empty;
    grid.MasterTemplate.Templates[0].Columns["Deposit"].FormatString = "{0:#,##0.00}";

    //return;

    grid.MasterTemplate.Templates[0].Templates[0].Columns["Type"].IsVisible = false;

    grid.MasterTemplate.Templates[0].Templates[0].Columns["PaymentType"].Width = 100;
    grid.MasterTemplate.Templates[0].Templates[0].Columns["PaymentType"].HeaderTextAlignment = ContentAlignment.MiddleLeft;

    grid.MasterTemplate.Templates[0].Templates[0].Columns["EpayGLNumber"].Width = 100;
    grid.MasterTemplate.Templates[0].Templates[0].Columns["EpayGLNumber"].HeaderTextAlignment = ContentAlignment.MiddleLeft;

    grid.MasterTemplate.Templates[0].Templates[0].Columns["BankAccount"].Width = 100;
    grid.MasterTemplate.Templates[0].Templates[0].Columns["BankAccount"].HeaderTextAlignment = ContentAlignment.MiddleLeft;

    grid.MasterTemplate.Templates[0].Templates[0].Columns["AmountCollected"].Width = 100;
    grid.MasterTemplate.Templates[0].Templates[0].Columns["AmountCollected"].FormatString = "{0:#,##0.00}";

    grid.MasterTemplate.Templates[0].Templates[0].Columns["ReturnAmount"].Width = 120;
    grid.MasterTemplate.Templates[0].Templates[0].Columns["ReturnAmount"].Width = 120;
    grid.MasterTemplate.Templates[0].Templates[0].Columns["ReturnAmount"].FormatString = "{0:#,##0.00}";

    grid.MasterTemplate.Templates[0].Templates[0].Columns["Deposit"].Width = 120;
    grid.MasterTemplate.Templates[0].Templates[0].Columns["Deposit"].FormatString = "{0:#,##0.00}";
}

What am I missing?

Thanks

Carl

GridView

updated answer on 20 Jul 2026

2 answers

89 views

SpinEditor and DropDownList got Bugs in Version 2026.2.702

I have a WinForms-App with .NET 8

I put two Controls in the Form (nothing else, not one line of code)

private Telerik.WinControls.UI.RadDropDownList radDropDownList1;
private Telerik.WinControls.UI.RadSpinEditor radSpinEditor1;

The SpinEditor does not Spin, updown-buttons don't work, updown-keys don't work.

The Dropdownlist, does not dropdown when clicking on the down-arrow (it does nothing then)

but it drops down when clicking in the white textbox area.

I changed my version back to 2025.2.520, what I used before, and everything works perfect.
Something happened in this library update. It's unusable as it is now.

DropDownList

SpinEditor

answered on 20 Jul 2026

2 answers

48 views

How to tell if Radscheduler appointment is new or not before editdialog starts

I did not see a Rad scheduler editing or creating event to check. Which one can I use?

How can I tell if am creating a new appt or just editing?

--/Greg

Scheduler and Reminder

answered on 06 Jul 2026

2 answers

69 views

[Solved] Can netizens assist in testing RadPdfViewer for malfunctions when reading PDF files?

請幫忙測試 RadPdfViewer 在讀取 PDF 檔案時是否有問題。

作業系統：Windows 11 25H2 26200.8655

請確認ucrtbase.dll版本是否為 10.0.26100.8521。

路徑：C：\Windows\System32\ucrtbase.dll

在此資料夾中找到檔案【鼎新Picture.exe】並雙擊執行。

畫面會打開並載入【NG.pdf】。

測試檔案已附上

視訊連結路徑

I tested these four versions of ucrtbase.dll, and only version 10.0.26100.1591 can be enabled.

PdfViewer and PdfViewerNavigator

answered on 02 Jul 2026

2 answers

69 views

Easily Resize the "Type a Message" box

Is there a fairly easy way to control the size of the box used to type the message into please? Even better would be to have the ability to add (or turn on) a resize handle so the user can resize the Text box to their desired size. An 'auto resize to fit content' would be another winner if possible. I know these controls are very functional and I suspect most of what is asked here is already possible.

Thank you in advance...

Simon

Conversational UI, Chat

SplitContainer

answered on 29 Jun 2026

1 answer

51 views

RadMessageBox throwing exception

I've recently had several instances where callingRadMessageBox throws an exception deep inside the Telerik WinForms framework.

This was using version 2026.1.415.48, I have just today updated to 2026.2.520.48.

In both cases the calling code is similar to this

RadMessageBox.SetThemeName ( ScenarioGlobal.G_Theme.ThemeName );
RadMessageBox.Instance.TopMost = true;
RadMessageBox.Show ( null, successText, ScenarioGlobal.G_Form_Title, MessageBoxButtons.OK, Resources.Info_48x48 );

The resulting stack trace in both cases, is as follows

System.InvalidOperationException: Invoke or BeginInvoke cannot be called on a control until the window handle has been created.

   at System.Windows.Forms.Control.MarshaledInvoke(Control caller, Delegate method, Object[] args, Boolean synchronous)

   at System.Windows.Forms.Control.Invoke(Delegate method, Object[] args)

   at Telerik.WinControls.UIAutomation.RadControlBaseRootUIAutomationProvider`1.get_BoundingRectangle() in C:\a\1\s\RadControls\RadControlsUI\Accessibility\UIAutomation\RadControlBaseRootUIAutomationProvider.cs:line 50

   at Telerik.WinControls.UIAutomation.Window.RadFormUIAutomationProvider.Form_Resize(Object sender, EventArgs e) in C:\a\1\s\RadControls\RadControlsUI\Accessibility\UIAutomation\Window\RadFormUIAutomationProvider.cs:line 261

   at System.Windows.Forms.Control.OnResize(EventArgs e)

   at System.Windows.Forms.Form.OnResize(EventArgs e)

   at System.Windows.Forms.Control.OnSizeChanged(EventArgs e)

   at System.Windows.Forms.Control.UpdateBounds(Int32 x, Int32 y, Int32 width, Int32 height, Int32 clientWidth, Int32 clientHeight)

   at System.Windows.Forms.Control.UpdateBounds(Int32 x, Int32 y, Int32 width, Int32 height)

   at System.Windows.Forms.Control.SetBoundsCore(Int32 x, Int32 y, Int32 width, Int32 height, BoundsSpecified specified)

   at System.Windows.Forms.Form.SetBoundsCore(Int32 x, Int32 y, Int32 width, Int32 height, BoundsSpecified specified)

   at Telerik.WinControls.UI.RadFormControlBase.SetBoundsCore(Int32 x, Int32 y, Int32 width, Int32 height, BoundsSpecified specified) in C:\a\1\s\RadControls\RadControlsUI\RadForm\RadFormNew\RadFormControlBase.cs:line 1909

   at System.Windows.Forms.Control.SetBounds(Int32 x, Int32 y, Int32 width, Int32 height, BoundsSpecified specified)

   at System.Windows.Forms.Control.set_Size(Size value)

   at System.Windows.Forms.Control.SetClientSizeCore(Int32 x, Int32 y)

   at System.Windows.Forms.Form.SetClientSizeCore(Int32 x, Int32 y)

   at Telerik.WinControls.UI.RadFormControlBase.SetClientSizeCore(Int32 x, Int32 y) in C:\a\1\s\RadControls\RadControlsUI\RadForm\RadFormNew\RadFormControlBase.cs:line 1861

   at Telerik.WinControls.UI.RadFormControlBase.OnThemeChanged() in C:\a\1\s\RadControls\RadControlsUI\RadForm\RadFormNew\RadFormControlBase.cs:line 1578

   at Telerik.WinControls.ComponentThemableElementTree.set_ThemeName(String value) in C:\a\1\s\RadControls\RadControl\TPF\Control\ComponentThemableElementTree.cs:line 144

   at Telerik.WinControls.UI.RadFormControlBase.set_ThemeName(String value) in C:\a\1\s\RadControls\RadControlsUI\RadForm\RadFormNew\RadFormControlBase.cs:line 2091

   at Telerik.WinControls.RadMessageBox.SetThemeName(String themeName) in C:\a\1\s\RadControls\RadControlsUI\UIElements\RadMessageBox\RadMessageBox.cs:line 37

Is this somethingmy application is doing / not doing or a "feature" of the RadMessageBox?

Cheers
Toby

MessageBox

answered on 19 Jun 2026