Recently Updated
Completed
Last Updated:
11 Nov 2025 08:11
by ADMIN
Release Telerik UI for WPF 2025.4.1111 (2025 Q4)
Created by:
Martin Ivanov
Comments:
3
Category:
SyntaxEditor
Type:
Bug Report
By default, when typing text in the RadSyntaxEditor and you reach the end of the viewport (horizontally or vertically), the control auto-scrolls so that the newly typed character is within the viewport. This behavior stops working after you zoom-in the editor.
Completed
Last Updated:
11 Nov 2025 08:11
by ADMIN
Release Telerik UI for WPF 2025.4.1111 (2025 Q4)
Created by:
Martin Ivanov
Comments:
0
Category:
SyntaxEditor
Type:
Bug Report
NullReferenceException thrown on opening the CompletionListWindow when RadSyntaxEditor is hosted in a non-WPF application (usually WinForms) and there are no WPF Application and MainWindow initialized.
This can happen if the RadSyntaxEditor for WPF is hosted in a WinForms application. In this scenario the System.Windows.Application.Current and its MainWindow are not initialized, which is what the IntelliPrompt positioning logic relies on.
Exception details:
System.NullReferenceException: 'Object reference not set to an instance of an object.'
> Telerik.Windows.Controls.SyntaxEditor.dll!Telerik.Windows.Controls.SyntaxEditor.UI.IntelliPromptBase.SetPosition(System.Windows.Point pointInScreen) Line 452 C# Telerik.Windows.Controls.SyntaxEditor.dll!Telerik.Windows.Controls.SyntaxEditor.UI.IntelliPromptBase.SetPosition(System.Windows.Point pointInEditorPresenter, System.Windows.Point pointAboveTheCaret) Line 442 C# Telerik.Windows.Controls.SyntaxEditor.dll!Telerik.Windows.Controls.SyntaxEditor.UI.IntelliPromptBase.SetPositionInView() Line 480 C# Telerik.Windows.Controls.SyntaxEditor.dll!Telerik.Windows.Controls.SyntaxEditor.UI.IntelliPromptBase.InitializeIntellisense() Line 401 C# Telerik.Windows.Controls.SyntaxEditor.dll!Telerik.Windows.Controls.SyntaxEditor.UI.IntelliPromptBase.Show(Telerik.Windows.Controls.SyntaxEditor.UI.CaretPosition caretStartPosition, Telerik.Windows.Controls.SyntaxEditor.UI.CaretPosition caretEndPositions) Line 211 C#
Telerik.Windows.Controls.SyntaxEditor.dll!Telerik.Windows.Controls.SyntaxEditor.UI.IntelliPromptBase.Show() Line 182 C#To work this around, you can initialize a new WPF application and MainWindow and create a hidden HwndSource for the MainWindow. This should happen before showing the WPF content in the WinForms application's code.
public Form1()
{
InitializeComponent();
new System.Windows.Application();
System.Windows.Application.Current.MainWindow = new System.Windows.Window();
var parameters = new HwndSourceParameters("HiddenHost")
{
Width = 1, Height = 1,
WindowStyle = unchecked((int)0x80000000) // WS_POPUP | WS_EX_NOACTIVATE
};
var hwndSource = new HwndSource(parameters);
hwndSource.RootVisual = System.Windows.Application.Current.MainWindow;
// other code here
ElementHost host = new ElementHost { Dock = DockStyle.Fill };
host.Child = wpfControl
this.Controls.Add(host);
}
Completed
Last Updated:
21 May 2025 07:52
by ADMIN
Release 2025.2.521 (2025 Q2)
Created by:
Martin Ivanov
Comments:
0
Category:
SyntaxEditor
Type:
Bug Report
The CSharpTagger matches the following character combination as a multiline comment start - / * (slash and a start with a whitespace between). This causes wrong tags creation in scenarios where the * character is a part of a single line comment. The correct comment start and end should be /* and */.
In the following example, the beginning of the first single line comment is considered a multiline comment start, but since nothing closes it, the entire text is tagged and colored as a comment.
In the following example, the beginning of the first single line comment is considered a multiline comment start, but since nothing closes it, the entire text is tagged and colored as a comment.
// ***********************************************************************
// some other content here
// some other content here
// ***********************************************************************
public class TestClass
{
}
Completed
Last Updated:
13 Mar 2024 09:45
by ADMIN
Release 2024.1.130 (2024 Q1)
Created by:
Felix
Comments:
0
Category:
SyntaxEditor
Type:
Feature Request
Currently the Caret of the SyntaxEditor does not behave like Caret in MS TextBox/ RichTextBox when IME is opened - IME opens on the bottom right part of the screen instead of below the caret. Also some input issues when selection is done in the IME should be addressed for a full support of this feature.
Completed
Last Updated:
13 Jul 2023 08:43
by ADMIN
Release R2 2023 SP1
Created by:
Martin Ivanov
Comments:
0
Category:
SyntaxEditor
Type:
Feature Request
Localize the tooltips for the match case button, the match word button and the use regular expression button.
Currently, the tooltips of the buttons are using hardcoded strings in English.
To translate the tooltips, you can get the corresponding buttons on load of the syntax editor control and replace their tooltips manually.
private void syntaxEditor_Loaded(object sender, RoutedEventArgs e)
{
var buttons = this.syntaxEditor.ChildrenOfType<RadToggleButton>();
var matchCaseButton = buttons.FirstOrDefault(x => x.Name == "PART_MatchCaseButton");
var matchWordButton = buttons.FirstOrDefault(x => x.Name == "PART_MatchWordButton");
var useRegularExpressionsButton = buttons.FirstOrDefault(x => x.Name == "PART_UseRegularExpressionsButton");
matchCaseButton.ToolTip = CreateToolTip("SyntaxEditor_MatchCase"); // these are custom localization resource keys that should be manually defined by the developer that uses this solution
matchWordButton.ToolTip = CreateToolTip("SyntaxEditor_MatchWord");
useRegularExpressionsButton.ToolTip = CreateToolTip("SyntaxEditor_UseRegularExpressions");
}
private static ToolTip CreateToolTip(string resourceKey)
{
var toolTip = new ToolTip();
toolTip.Content = LocalizationManager.Manager.GetStringOverride(resourceKey);
return toolTip;
}
Completed
Last Updated:
20 Jun 2023 06:04
by ADMIN
Release LIB 2023.2.619 (19 Jun 2023)
Created by:
BENN
Comments:
0
Category:
SyntaxEditor
Type:
Bug Report
Searching "windows" in the text "Windows Windows Windows" with option MatchCase highlights all windows which is wrong - no highlight should be performed
Completed
Last Updated:
02 Jun 2023 08:39
by ADMIN
Release R2 2023
Created by:
Stenly
Comments:
0
Category:
SyntaxEditor
Type:
Bug Report
An exception is thrown when the RadSyntaxEditor is disabled with the Expression_Dark theme being applied with StyleManager.
Completed
Last Updated:
27 Apr 2023 07:51
by ADMIN
Release R2 2023
Created by:
Andrea.Gasparini
Comments:
7
Category:
SyntaxEditor
Type:
Feature Request
Good morning,
can You implement in one of the next releases the regex and case sensitive search? I provided you the Visual Studio 2019 search screenshot
Completed
Last Updated:
16 Mar 2023 05:55
by ADMIN
Release LIB 2023.1.320 (20 Mar 2023)
Created by:
Chris
Comments:
0
Category:
SyntaxEditor
Type:
Bug Report
Single line folding regions is falsely recognized (by default it should be avoided) and messes up with outer regions.
For example
1 [
2 [ inner region]
3]
There should be no folding button on the inner line. Collapsing line 1 does not collapse 3 but only 1 and 2 which is wrong.
Completed
Last Updated:
06 Mar 2023 15:23
by ADMIN
Release R1 2023 SP1
Created by:
Petar
Comments:
0
Category:
SyntaxEditor
Type:
Bug Report
Enter key is improperly handled internally and this results in inability to use the key in combination with other modifier keys for custom commands.
For example this custom code completion command does not fire when pressing Ctrl + Enter:
private void syntaxEditor_Loaded(object sender, RoutedEventArgs e)
{
var completionCommand = this.syntaxEditor.Commands.CodeCompletionCommand;
InputBinding keyBinding = null;
foreach (InputBinding item in this.syntaxEditor.EditorPresenter.Caret.InputBindings)
{
if (item.Command == completionCommand)
{
keyBinding = item;
break;
}
}
// unregister old key binding via Caret InputBindings
this.syntaxEditor.EditorPresenter.Caret.InputBindings.Remove(keyBinding);
// register new command in Syntaxeditor
this.syntaxEditor.KeyBindings.RegisterCommand(completionCommand, Key.Enter, ModifierKeys.Control);
}
For example this custom code completion command does not fire when pressing Ctrl + Enter:
private void syntaxEditor_Loaded(object sender, RoutedEventArgs e)
{
var completionCommand = this.syntaxEditor.Commands.CodeCompletionCommand;
InputBinding keyBinding = null;
foreach (InputBinding item in this.syntaxEditor.EditorPresenter.Caret.InputBindings)
{
if (item.Command == completionCommand)
{
keyBinding = item;
break;
}
}
// unregister old key binding via Caret InputBindings
this.syntaxEditor.EditorPresenter.Caret.InputBindings.Remove(keyBinding);
// register new command in Syntaxeditor
this.syntaxEditor.KeyBindings.RegisterCommand(completionCommand, Key.Enter, ModifierKeys.Control);
}
Completed
Last Updated:
06 Mar 2023 15:04
by ADMIN
Release R1 2023 SP1
Created by:
Luc
Comments:
0
Category:
SyntaxEditor
Type:
Bug Report
string link = "https:////_a_w_e_bsite.com" will falsely recognize a commented section and color it in CSharpTagger
Expected : no commented section and comment coloring in this code line
Expected : no commented section and comment coloring in this code line
Completed
Last Updated:
18 Nov 2022 06:13
by ADMIN
Release LIB 2022.3.1121 (21 Nov 2022)
Created by:
Tom
Comments:
0
Category:
SyntaxEditor
Type:
Bug Report
Big text with many lines or lines long enough to cover the viewport height when wrapped with word wrapping break the virtualization mechanism in RadSyntaxEditor. This makes the scrolling and resizing performance slow.
Completed
Last Updated:
08 Sep 2022 15:41
by ADMIN
Release R3 2022
Created by:
Petar
Comments:
1
Category:
SyntaxEditor
Type:
Feature Request
Add ability to disable horizontal scrollbar and enable word wrapping - fixed width of editor and if the word cannot fit - it is moved to next line.
Completed
Last Updated:
18 Jul 2022 06:40
by ADMIN
Release LIB 2022.2.718 (18 July 2022)
Created by:
Ayrton1981
Comments:
0
Category:
SyntaxEditor
Type:
Bug Report
The completion list appears transparent when the Material theme is applied.
Completed
Last Updated:
29 Jun 2022 07:24
by ADMIN
Release LIB 2022.2.704 (04 July 2022)
Created by:
n/a
Comments:
0
Category:
SyntaxEditor
Type:
Feature Request
Expose API to control the FontWeight and FontStyle of the highlighted words.
Completed
Last Updated:
21 Apr 2022 14:03
by ADMIN
Release LIB 2022.1.207 (7 Feb 2022)
Created by:
Petar
Comments:
0
Category:
SyntaxEditor
Type:
Bug Report
For example "//====" will not be commented in C#.
Or "!====" wont' be commented in custom language if "!" is the commenting symbol.
The issue resides in the word splitting function in WordTaggerBase class.
Completed
Last Updated:
11 Oct 2021 14:28
by ADMIN
Release LIB 2021.3.1018 (18 Oct 2021)
Created by:
Dinko
Comments:
0
Category:
SyntaxEditor
Type:
Bug Report
When using LineHighlightTagger a NullReferenceException is thrown. To workaround this exception, you can add a custom TextFormatDefinition object to the TextFormatDefinitions collection of the RadSyntaxEditor.
this.syntaxEditor.TextFormatDefinitions.AddLast(LineHighlightTagger.LineHighlightFormatDefinition, new TextFormatDefinition(new Telerik.Windows.Controls.SyntaxEditor.UI.Pen(new SolidColorBrush(Colors.Gray), new Thickness(1))));
Completed
Last Updated:
31 May 2021 08:01
by ADMIN
Release LIB 2020.2.406 (04/06/2020)
Created by:
Dinko
Comments:
0
Category:
SyntaxEditor
Type:
Feature Request
A message could be shown when using the Find mechanism, and you reach the end of the file or the starting point of the search.
Completed
Last Updated:
05 May 2021 10:03
by Petar
Release LIB 2021.1.301 (1/03/2021)
Created by:
Martin Ivanov
Comments:
1
Category:
SyntaxEditor
Type:
Bug Report
In some cases the string values in the XML attributes are not colored with the expected color, but default to black.
This was reproduced when there is only single quotation mark on visible on the line. And also if the count of the visible quotation marks on the line is an odd number (not always reproducible).
Completed
Last Updated:
22 Mar 2021 07:24
by ADMIN
Release LIB 2021.1.322
Created by:
Pierre
Comments:
0
Category:
SyntaxEditor
Type:
Bug Report
Shift + Alt + Down Selection then typing multiple characters results in all of them being typed in all selected lines.
Shift + Alt _ Down Selection then typing multiple characters results in only the first one being typed in all lines, then selection is lost and next chars are inserted in the last selected line only.