Unplanned
Last Updated: 02 Sep 2025 14:22 by ADMIN

In this particular case, the control is in Self-Referencing binding mode. When we perform drag-and-drop operations multiple times, the application enters an invalid state and hangs. Additionally, during drag-and-drop operations, moving several nodes can lead to collapsing and hiding the parent or other nodes randomly.

Unplanned
Last Updated: 02 Sep 2025 08:55 by Bert
I have moved the mouse away, the pointer is not over an element of the NavigationView, but the SubPages remain visible. I would like it to be collapsed, and expand again when I move the mouse over the Page (the orange area).
Unplanned
Last Updated: 01 Sep 2025 13:55 by ADMIN
When a CommandColumn cell is focused and we try to focus an external control, the RadGridView can't lose focus. The internal code will force the control to focus the CommandColumn cell again.
Unplanned
Last Updated: 25 Aug 2025 11:20 by ADMIN

Steps to reproduce:

1. Bind the grid to BindingList

2. Call BestFitColumns method in form's constructor

3. Use Fluent/Crystal theme

4. Rebind the grid by setting DataSource=null

5. Exception is thrown

Stack trace:

en Telerik.WinControls.UI.BestFitHelper.SetColumnWidth(GridViewColumn column, Single desiredWidth)
   en Telerik.WinControls.UI.BestFitHelper.BestFitColumnCore(GridViewColumn column, BestFitColumnMode mode)
   en Telerik.WinControls.UI.BestFitHelper.ProcessRequests()
   en Telerik.WinControls.UI.GridTableElement.UpdateAll()
   en Telerik.WinControls.UI.GridTableElement.UpdateViewCore(Object sender, DataViewChangedEventArgs args)
   en Telerik.WinControls.UI.GridTableElement.UpdateView(Object sender, DataViewChangedEventArgs args)
   en Telerik.WinControls.UI.GridTableElement.ProcessTemplateEvent(GridViewEvent eventData)
   en Telerik.WinControls.UI.GridTableElement.Telerik.WinControls.UI.IGridViewEventListener.ProcessEvent(GridViewEvent eventData)
   en Telerik.WinControls.UI.GridViewEventProcessEntity.ProcessCollection(GridViewEvent gridEvent, PriorityWeakReferenceList list, GridEventProcessMode processMode)
   en Telerik.WinControls.UI.GridViewEventProcessEntity.ProcessEvent(GridViewEvent gridEvent)
   en Telerik.WinControls.UI.GridViewSynchronizationService.NotifyListeners(GridViewEvent gridEvent)
   en Telerik.WinControls.UI.GridViewSynchronizationService.FlushEvents()
   en Telerik.WinControls.UI.GridViewSynchronizationService.DispatchEvent(GridViewEvent gridEvent)
   en Telerik.WinControls.UI.GridViewSynchronizationService.DispatchEvent(GridViewTemplate template, GridViewEvent eventData, Boolean postUI)
   en Telerik.WinControls.UI.GridViewTemplate.DispatchEvent(GridViewEvent gridEvent, Boolean postUI)
   en Telerik.WinControls.UI.GridViewTemplate.DispatchDataViewChangedEvent(Object sender, DataViewChangedEventArgs args)
   en Telerik.WinControls.UI.GridViewTemplate.OnViewChanged(Object sender, DataViewChangedEventArgs e)
   en Telerik.WinControls.UI.MasterGridViewTemplate.OnViewChanged(Object sender, DataViewChangedEventArgs e)
   en Telerik.WinControls.UI.GridViewTemplate.CollectionView_CollectionChanged(Object sender, NotifyCollectionChangedEventArgs e)
   en Telerik.WinControls.Data.RadCollectionView`1.OnCollectionChanged(NotifyCollectionChangedEventArgs args)
   en Telerik.WinControls.Data.RadDataView`1.RebuildData(Boolean notify)
   en Telerik.WinControls.Data.RadDataView`1.RefreshOverride()
   en Telerik.WinControls.Data.RadDataView`1.ProcessCollectionChanged(NotifyCollectionChangedEventArgs args)
   en Telerik.WinControls.Data.RadCollectionView`1.source_CollectionChanged(Object sender, NotifyCollectionChangedEventArgs e)
   en Telerik.WinControls.Data.NotifyCollectionChangedEventHandler.Invoke(Object sender, NotifyCollectionChangedEventArgs e)
   en Telerik.WinControls.Data.RadListSource`1.OnCollectionChanged(NotifyCollectionChangedEventArgs e)
   en Telerik.WinControls.Data.RadListSource`1.EndUpdate(Boolean notifyUpdates)
   en Telerik.WinControls.Data.RadListSource`1.Initialize()
   en Telerik.WinControls.Data.RadListSource`1.Bind(Object dataSource, String dataMember)
   en Telerik.WinControls.Data.RadListSource`1.set_DataSource(Object value)
   en Telerik.WinControls.UI.GridViewTemplate.set_DataSource(Object value)
   en Telerik.WinControls.UI.RadGridView.set_DataSource(Object value)

Unplanned
Last Updated: 25 Aug 2025 06:59 by ADMIN
Created by: Svitlana
Comments: 1
Category: PictureBox
Type: Bug Report
0

Overview

A bug found in the Telerik PictureBox control for Windows Forms. The issue specifically affects the rendering of SVG graphics, where the text element is being duplicated by the viewer.

Affected Component

- Product: Telerik UI for WinForms
- Control: `RadPictureBox'
- Version: 2025.02
- Platform: Windows Forms (.NET Framework)

Steps to Reproduce

1. Run the application from provided MCVE
2. Observe the text in SVG preview: the text is duplicated twice 
3. Zoom in the view
4. Observe the text in SVG preview: there are many instances of the same text

Expected Behavior

The Telerik PictureBox should render only a single instance of the text from SVG file.

Actual Behavior

PictureBox shows many instances of the same text and the specifix number of them depends on the zoom level.

Sample Files

- ✅ `example.svg`: A SVG file that renders correctly in Microsoft Edge. 
- ✅ `browser.png`: Screenshot of how the SVG file looks in Microsoft Edge. 
- ✅ `browser_after_zoom.png`: Screenshot of how the SVG file looks in Microsoft Edge after 150% zoom. 
- ❌ `telerik.png`: Screenshot of how the same file looks in the Telerik PictureBox.
- ❌ `telerik_after_zoom.png`: Screenshot of how the same file looks in the Telerik PictureBox after zooming in.

Environment

| Component      | Version            |
|----------------|--------------------|
| Telerik UI     | 2025.2.520.48      |
| .NET Framework | .NET Framework 4.8 |
| OS             | Windows 11         |

Unplanned
Last Updated: 13 Aug 2025 11:20 by ADMIN
Created by: Martin
Comments: 1
Category: TextBox
Type: Feature Request
1

When I create 100 TextBox's, it take about 5 ms. So that is 0,05 ms. per TextBox.

When I create 100 RadTextBox's, it takes about 1335 ms. So that is 13,35 ms. per RadTextBox.

That is a factor 267 difference!

I know a RadTextBox is much more complex that a TextBox, it creates many sub controls / instances / objects / etc, but still. I must create 60 miljoen array's of 100 bytes to get the same delay / performance, so object creation cannot be it.

Now I have to requests:

  1. Make the RadTextBox faster (and while you are on it, maybe take a look at the other controls). Maybe with some lazy loading, reusing of objects, etc.
       ...or...
  2. Make the controls resettable. For example: Give them a IResettableControl interface (with method void Reset()). Resetting the control brings it back to it initials state (all properties to their default state, all users event handlers removed from the events, etc.

When option 2 is implemented, the control can be place in a pool an be reused. 

Background info: I create a lot of controls in a "factory" based on an enum ControlType (with elements like TextBox, CheckBox, etc.) This factory could facilitate pooling.

Unplanned
Last Updated: 12 Aug 2025 08:40 by ADMIN

When the RadSpreadsheet is docked and the TelerikMetroTouch theme is applied, the Vertical ScrollBar is not fully visible.

Unplanned
Last Updated: 05 Aug 2025 13:29 by ADMIN
 Currently, the auto complete function works by searching only in the RadCheckedListDataItem.Text and does not consider the DescriptionText.
Unplanned
Last Updated: 01 Aug 2025 14:04 by ADMIN
Created by: Tony
Comments: 1
Category: Scheduler/Reminder
Type: Feature Request
1
Expose a way to define working hours per resource.
Unplanned
Last Updated: 30 Jul 2025 08:07 by ADMIN
When updating, adding, or removing a row in Load-On-Demand Hierarchy, we will need to force the control to refresh. This will trigger the control to render all cells again.
Unplanned
Last Updated: 29 Jul 2025 14:05 by ADMIN
Created by: AndreaT
Comments: 1
Category: PdfViewer
Type: Bug Report
1
Text is not rendered due to a missing font. In this case, the font is ArialBoldItalic, which the control could not find. 
Unplanned
Last Updated: 28 Jul 2025 13:22 by ADMIN
In the following scenario, we clicked on the GridViewSelectColumn header checkbox, which selects all the rows in the RadGridView. This will trigger the SelectionChanging event of the control. Canceling the event will cancel the whole operation. There is no API to remove specific rows from being selected in this operation.
Unplanned
Last Updated: 24 Jul 2025 14:14 by ADMIN
Created by: Emanuele
Comments: 1
Category: VirtualGrid
Type: Bug Report
1

Pin columns cut the content of custom cells.

Unplanned
Last Updated: 23 Jul 2025 14:13 by ADMIN
Created by: Pascal
Comments: 3
Category: UI for WinForms
Type: Bug Report
0

In the Visual Theme Builder (fresh installed Telerik UI for WinForms) you'll get an error because the directory "VbsRecoveryData" seems to be missing. Creating the directory before "package.Compress(path)" fixes this for me.


Unplanned
Last Updated: 23 Jul 2025 12:56 by ADMIN

I want to choose columns by checkboxes, something like this:

 

Unplanned
Last Updated: 22 Jul 2025 13:31 by ADMIN
Unplanned
Last Updated: 16 Jul 2025 13:23 by ADMIN
In this scenario, the RadDateTimePicker control is set in the following way:

public Form1() { InitializeComponent(); this.radDateTimePicker1.MaskProviderCreated += RadDateTimePicker1_MaskProviderCreated; this.radDateTimePicker1.DateTimePickerElement.ShowCurrentTime = false; this.radDateTimePicker1.Format = System.Windows.Forms.DateTimePickerFormat.Custom; this.radDateTimePicker1.Culture = new System.Globalization.CultureInfo("en-US"); this.radDateTimePicker1.CustomFormat = "hh:mm:ss tt";
this.radDateTimePicker1.Value = new System.DateTime(2025, 6, 12, 12, 4, 34, 562); }

When we focus the text editor daytime part(last part) we can't change it from PM to AM by clicking the A key. However, the opposite way is working. When we have AM and clicking the P key will change it to PM.
Unplanned
Last Updated: 16 Jul 2025 11:31 by ADMIN

As the Subject states, we are running into issues where the combo is not fully displaying the first time it is opened.  Run the form on high DPI, open the popup, and scroll to the botom:

Unplanned
Last Updated: 16 Jul 2025 08:27 by ADMIN
The Vertical Scroll Bar's range is not properly updating every time after collapsing a node programmatically. In our case, we have several levels of node element hierarchy. Calling the Collapse() method of the first-level node will not correctly calculate the vertical scrollbar range.
Unplanned
Last Updated: 15 Jul 2025 14:34 by Matthew
1 2 3 4 5 6