I’m converting 20+ year old c# .net winform software that a clever internal ex dev wrote a themed control suite for. I’ve been working with those controls for almost the same length of time but am recently tasked with updating the whole app as customers are experiencing fall overs on some modern versions of Windows. Ive had the pleasure of (almost quietly ?) converting/updating by using Telerik for many years as my choice of replacement themed control systems.

Conversion experience has been pretty good, except for combo boxes, probably listboxes too (sorry guys Im writing this in bed at 5am so can’t/won’t just go testing). I did try, i think, using your conversion wizards without success. I do wish that you’d let us add any type of object to a combobox.item array in the same way that microsoft winform control allows.
Ive also noticed that some events dont occur in telerik, eg index changed need to be switched to valuechanged and these are only spotted when testing, which means extra work.

anyway. Bless an thanks to you all for my good experience with Progress/Telerik. Im old, poorly and crumbly now and wont be around much longer. May i last long enough not to need a pension to survive and i hope each of you invests in enough private pension to give yourselves a decent holiday or three per year ;) 

When a RadValidationRule has the "PropertyName" assigned to a non-existent property, the RadVAlidationProvider.ValidateCore throws a NullReference exception because the property cannot be found via reflection and throws no error handling.

From OpenEdge ABL class, this is the code written into the forms InitializeComponent method.  The "IsValid"  property doesn't actually exist.

        radValidationRule3:AddControl(THIS-OBJECT:myTextBox).         radValidationRule3:Operator = Telerik.WinControls.Data.FilterOperator:IsNotEqualTo.         radValidationRule3:PropertyName = "IsValid".         radValidationRule3:ToolTipText = "Test".         radValidationRule3:Value = TRUE.

While we don't expect the functionality to actually work because the property isn't actually available to .NET, but the NullReferenceException is poorly handled.

I've attached a screenshot of the bit of code from RadValidationProvider.ValidateCore where this occurs.  This is from version 2020.3.1020.20

Here is the thrown stack exception details from visual studio.

System.NullReferenceException
HResult=0x80004003
Message=Object reference not set to an instance of an object.
Source=Telerik.WinControls.UI
StackTrace:
at Telerik.WinControls.UI.RadValidationProvider.ValidateCore(Object sender, EventArgs e)

This

Hi All.

Could you please add or let me know locators for "RadChat" window for Automation purpose. I am unable to find locators on the below area.

The annotation line is supposed to be at 05 point but instead it is between 05 and 06.

Hi,

I added a screen with RadSpreadsheet on it. When I open that screen from the parent screen, the DPI (scale) of the whole application changes.

Please find the source in the attachment.

Any anchor setting works, except for right + left, then the controls start to behave weird. 

this.radMultiColumnComboBox4.Anchor = AnchorStyles.Left | AnchorStyles.Right;
this.radTextBoxControl2.Anchor = AnchorStyles.Left | AnchorStyles.Right;
this.radSpinEditor4.Anchor = AnchorStyles.Left | AnchorStyles.Right;
this.radDropDownList4.Anchor = AnchorStyles.Left | AnchorStyles.Right;

this.radMultiColumnComboBox3.Anchor = AnchorStyles.Left | AnchorStyles.Right;
this.radDropDownList3.Anchor = AnchorStyles.Left | AnchorStyles.Right;
this.radSpinEditor3.Anchor = AnchorStyles.Left | AnchorStyles.Right;
this.radTextBoxControl1.Anchor = AnchorStyles.Left | AnchorStyles.Right;

After more than 10 years this is STILL a Bug. 

https://feedback.telerik.com/winforms/1369181-fix-radgroupbox-with-collapsed-header-does-not-fill-the-entire-content-if-there-is-a-docked-child-control-inside-the-groupbox

The groupbox header does not collapse when I put a table layout panel inside of it.

Is this product (Telerik for winforms) still being supported? Or should I be looking elsewhere for a different controls toolkit solution for my company?

Hi, the new feauture Merge Cells is very nice but the alignment is only at the center.

Can I align the merged cells in the same mode of the column?

Thanks, Fabrizio

When I update to version 2024.3.806 I get a build error :

Please consider integration / enhancement of the following rich sting rendering capabilities enabling performance for quick rich string related rendering tasks, providing further alternatives to GDI and GDI+ based tiresome and limited solutions, allowing scaling: https://github.com/toptensoftware/RichTextKit

Set IsThreeState property to true and choose ToggleState to Indeterminate.

Office2019Dark:

Office2019Light:

I would like to see a new property added to the RadLabel control: Style. Style is an enumeration with layout styles like in MS-Word: 

• Normal
• Title
• Heading 1
• Heading 2
• etc.

When the style is applied, the styling (font, color, background, etc.) is applied conform the currently active Theme. Therefor all themes need to be expended to support this setting.

Of course the enum label 'Custom' should be present (or null) when a user tries to override the style-related properties (like font, color, background, etc.)

This is very usefull when a programmer wants to build his own form (with or without Layout / Flow controls).

Telerik already uses it a bit themselves: Some (data entry) controls already generate (group) headers and captions in there forms. 

Hello there,

I am facing system.StackOverflowExcepiton while exporting document with HtmlFormatProvider. I am attaching my code with the HTML string which I am passing into RichTextEditor.

---------------------------------------------------------

HTML String:

"Navigate to the <a href="https://exelon.ifs.cloud/landing-page/" target="_blank"><b><u>IFS Cloud Landing Page</u></b></a>.<br /> <br />NOTE: If the above link does not work for you, copy and paste this address ...<br /> <br /><u>https://exelon.ifs.cloud/landing-page/</u>"

---------------------------------------------------------

Method which is giving me an error:

internal static string GetRadRichTextEditorHtmlValue(RadRichTextEditor radRichTextEditor, bool RemoveNewLineSpace = false, bool withDocumentChange = true, bool removeLastParagraphLine = false, bool fromDefinationEditor = false, bool OnlyHtml = false, bool fromDynamicAssetDefinition = false)
        //internal static string GetRadRichTextEditorHtmlValue(RadRichTextEditor radRichTextEditor, bool RemoveNewLineSpace = false, bool withDocumentChange = true, bool removeLastParagraphLine = false, bool fromDefinationEditor = false,bool OnlyHtml=false)
        {
            string htmlValue = string.Empty;

            try
            {
                if (radRichTextEditor == null)
                    return "";

                Telerik.WinForms.Documents.Model.RadDocument document = radRichTextEditor.Document;
                Telerik.WinForms.Documents.FormatProviders.Html.HtmlFormatProvider provider = new Telerik.WinForms.Documents.FormatProviders.Html.HtmlFormatProvider();
                if (withDocumentChange)
                {
                    //Telerik.WinForms.Documents.FormatProviders.Html.HtmlExportSettings htmlExportSettings = new Telerik.WinForms.Documents.FormatProviders.Html.HtmlExportSettings();
                    //htmlExportSettings.ExportHeadingsAsTags = true;
                    //provider.ExportSettings = htmlExportSettings;
                    //htmlExportSettings.PropertiesToIgnore["h1"].Add("Heading1");
                    provider.ExportSettings.DocumentExportLevel = Telerik.WinForms.Documents.FormatProviders.Html.DocumentExportLevel.Fragment;
                    provider.ExportSettings.ExportFontStylesAsTags = true;
                }
htmlValue = provider.Export(document); // Exception place.
                if (withDocumentChange)
                {
                    string strikeClassName = GetStrikeClassName(htmlValue);
                    htmlValue = GetTagValueFromHtmlString(htmlValue, fromDefinationEditor, fromDynamicAssetDefinition);
                    htmlValue = StripHtmlExceptFontTags(htmlValue, strikeClassName, RemoveNewLineSpace, OnlyHtml);
                }
                document.Dispose();
            }
            catch (Exception ex)
            {
                ClickLearn.Exceptions.ExceptionToEventLog(ex, "GetRadRichTextEditorHtmlValue");
            }

            // TO DO: Remove below condition when <br/> issue fixed fom editor
            if (htmlValue.IndexOf("<br />") == 0 || htmlValue.IndexOf("</ br>") == 0)
            {
                htmlValue = htmlValue.Substring(6);
            }
            else if (htmlValue.IndexOf("<br/>") == 0 || htmlValue.IndexOf("</br>") == 0)
            {
                htmlValue = htmlValue.Substring(5);
            }

            if (!string.IsNullOrEmpty(htmlValue))
            {
                htmlValue = RemoveLastNewLine(htmlValue);
            }

            return htmlValue;
        }

---------------------------------------------------------

Control's properties:

ucRichTextBox ucRichTextBox2 = new ucRichTextBox(tagCommand.Tags, ce.CurrentLCID, true, MetadataProperties, ArgInfoList);
ucRichTextBox2.spd = spd;
ucRichTextBox2.Tag = tagCommand.Tags;
ucRichTextBox2.Name = "ucRichTextBox2";
ucRichTextBox2.Left = sx;
ucRichTextBox2.Top = y;
ucRichTextBox2.Width = pnlSPD.Width - leftPadding - rightPadding;
ucRichTextBox2.btnUnlock.Click += BtnUnlock_Click;
ucRichTextBox2.btnUnlock.Image = Properties.Resources.c_full;
ucRichTextBox2.btnUnlock.Tag = "c_full";
ucRichTextBox2.btnLockOption.Visible = true;
ucRichTextBox2.btnLockOption.BringToFront();
ucRichTextBox2.btnLockOption.MouseDown += BtnLockOption_MouseDown;
ucRichTextBox2.btnLink.Click += BtnLink_Click;
ucRichTextBox2.rtxContent.CommandExecuting += RtxContent_CommandExecuting;
ucRichTextBox2.btnSetting.ButtonElement.ToolTipText = argInfoUX12.ConfigDoc.ContainsKey

---------------------------------------------------------

UI for the control:

---------------------------------------------------------

Error message:

When trying to open the QuickStart solution from 

C:\Program Files (x86)\Progress\Telerik UI for WinForms 2025 Q1\Examples

installation folder, the following error appears: