Last Updated: 01 Jul 2024 11:22 by ADMIN
Release 2024.2.701 (Preview)

In the Swimlane diagram example (Data Visualization -> Diagrams -> Swimlane) the application crashes, showing at least one but often more than one error message.

How to reproduce:

  • Open the Swimlane example.
  • Click the area that is labelled as "Process name" (also marked in the attached screenshot)
  • One or multiple Message boxes containing the exception message
{DependencyProperty.UnsetValue} is not a valid value for the Property "Background"

pop up (see other screenshot)

Last Updated: 20 Mar 2024 11:34 by Petar
The ExportToImage method of the RadDiagram control does not take into account transforms applied to the diagram items.
Last Updated: 20 Feb 2024 01:26 by Antonio

Currently, the print preview control provides only options for the current printer, the page orientation and the page size . Include the following options too:

 - Paper Format (Lettre, A4, etc.)
 - Paper Orientation (Portrait or Landscape)
 - Number of copies (1, 2, 3, ...)
 - Print Color Settings (Colors or Monochrome)
 - Margins
 - Resolution (DPI based on the capabilities of the printer)

Last Updated: 15 Feb 2024 10:41 by Martin Ivanov
Currently, when you select multiple shapes, you can rotate them altogether using the rotate icon displayed on top of the ManipulationAdorner visual (the rectangle that encloses the shapes). However, there is no property or a method that allows to programmatically provide a rotation angle for the adorner. 

Add a RotationAngle property or a Rotate() method or something similar that will automatically update the rotation of the ManipulationAdorner along with the shapes inside.
Last Updated: 23 Jan 2024 14:29 by ADMIN
If the ActiveTool of a RadDiagram instance is changed from a PointerTool to PanTool while a shape is being resized, shape will still be resizable when the mouse gets close to the resize rectangles. 
Last Updated: 21 Nov 2023 09:40 by Stenly

Add an option to modify the StartPoint and EndPoint properties of RadDiagramConnection instances via the SettingsPane.


This functionality can be achieved by modifying the default ControlTemplate of the SettingsPaneView element to include an additional RadTabItem instance in the RadTabControl element. In the additional RadTabItem, input controls can be used, such as the RadNumericUpDown element. These elements should modify properties that will be present in a custom LinkViewModelBase<NodeViewModelBase>> class. More specifically, the X and Y properties of the StartPoint and EndPoint properties of the RadDiagramConnection element.

The attached sample project shows the implementation of the above approach for achieving this requirement.

Last Updated: 20 Nov 2023 16:38 by Stenly

Add an option to customize the available colors in the SettingsPane control:

Last Updated: 20 Nov 2023 11:11 by Vladimir
Introduce the option for snapping connections while they are being drawn. 
Last Updated: 02 Aug 2023 05:55 by ADMIN
Release LIB 2023.2.807 (7 Aug 2023)
When performing an undo operation for restoring a deleted RadDiagramContainerShape containing a child shape, an InvalidOperationException is thrown. The scenario is reproduced when the RadDiagram is used in a databound scenario. 
Last Updated: 01 Aug 2023 07:11 by William
WPF Demo export as HTML does not work with specific examples
Last Updated: 24 May 2023 09:20 by ADMIN
Created by: Dinko | Tech Support Engineer
Comments: 0
Category: Diagram
Type: Bug Report

Last Updated: 19 Jan 2023 14:50 by ADMIN
Currently snapping to the grid is disabled when moving the mouse closer than 10 pixels to a shape. A constant can be exposed to control this distance.
Last Updated: 19 Jan 2023 14:50 by ADMIN
Release LIB 2022.3.1128 (28 Nov 2022)
Sometimes, when fast dragging a connector out of shape to create a new connection, connector might stay in Active state. This can also result in incorrect event args in ConnectionManupulationCompleted event leading to wrong application logic.
Last Updated: 19 Jan 2023 14:50 by ADMIN
An exception is raised when the active tool of the RadDiagram is ConnectorTool and a shape is clicked when its UseDefaultConnectors property is set to false.
Last Updated: 21 Nov 2022 09:19 by ADMIN
Created by: Bartosz
Comments: 2
Category: Diagram
Type: Bug Report


In project we have noticed that sometimes for RadDiagram.ConnectionManipulationCompleted we receive unexpected values in event.

This problem is not systematic but it occurs often at the drag of new connection.

To make it reproducible for you I used CustomConnectors sample project from Diagram.

For easier analysis I recorded a video with bug and changes to CustomConnectors project.


Best regards,


Last Updated: 07 Jun 2022 08:05 by ADMIN
Release LIB 2022.2.613 (13 June 2022)

NullReferenceException is thrown when trying to save RadDiagram instance that contains a RadDiagramShape with its Geometry assigned to a GeometryGroup value. 

To work this around, you can flatten the GeometryGroup before setting the shape's Geometry property. This is done by calling the GetFlattenedPathGeometry() method of the GeometryGroup.

shape.Geometry = group.GetFlattenedPathGeometry();

Last Updated: 29 Apr 2022 10:40 by ADMIN
Release R2 2022
Created by: Telerik Admin
Comments: 1
Category: Diagram
Type: Feature Request
Implement support (or extensibility) for printing the whole diagram in a single page.
Last Updated: 11 Apr 2022 10:54 by ADMIN
Release LIB 2022.1.411 (11 April 2022)

Most problematic issue when container can contains a container inside of it.

In mvvm demo project i modified load/save button to Clear diagram and display different content.

It works but after few click there is a recurrence call to update Z indices.

The reason to create such combination is to have hierarchy in diagram to display diagram from general view to detailed view.




Last Updated: 16 Feb 2022 14:11 by ADMIN
Release R1 2022 SP1

In a NetCore project, when dragging the diagram from the toolbox into the designer, an exception is thrown inside the designer. 

With Visual Studio 2019 Preview v. 16.10.0. Preview 2.0, Net 5 project => when dragging from the ToolBox - the VS goes into a non-responsive state (Vs is busy is shown or the VS crashed and closed automatically).

Last Updated: 11 Feb 2022 15:57 by ADMIN
Release LIB 2022.1.214 (14 Feb 2022)
When you select the Size tab and than select another shape where the Size should not be available, its content is shown whether is enabled or not. The SettingsPane should fallback to an enabled tab when one is disabled.

To work this around you can create a custom RadTabControl and implement custom fallback selection logic there. Then replace the RadTabConrol from the ControlTemplate of the SettingsPaneView with the custom tab control. Check the attached project.
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