Last Updated: 19 May 2022 14:24 by ADMIN
Release R2 2022 SP1
When saving and loading the RadDock layout from XML, the position of the tab is not preserved correctly.
Last Updated: 21 Apr 2022 05:32 by ADMIN
Use cases:

1. You have a MainDocumentContainer with Document windows in it, placed in one under the other. Setting the DockState of the bottom DocumentWindow to Hidden, and restoring it afterwards, should place the DocumentWindow at the same place, instead of merging it with the above one

2. Same layout as above, when the layout is saved and then restored, the DocumentWindow positions should be exactly as they were
Last Updated: 02 Feb 2022 12:27 by ADMIN

Use the following code snippet:

            ToolTabStrip tabStrip = this.toolWindow1.TabStrip as ToolTabStrip; 
            this.toolWindow1.Text = "<html><span style=\"font-family:Segoe UI;font-size:8.25;\"><b>Hello</b></span><span" +
   " style=\"font-family:Segoe UI;font-size:8.25;\">Woooooooooooooooooorld</span></html>";
            TextPrimitive text = tabStrip.CaptionElement.FindDescendant<TextPrimitive>();
            text.ClipDrawing = true;
            text.StretchHorizontally = false;
            text.DisableHTMLRendering = false;
            text.AutoEllipsis = false;

Last Updated: 13 Oct 2021 06:40 by ADMIN
Created by: Arikkan
Comments: 0
Category: Dock
Type: Bug Report
Please refer to the attached gif file illustrating better how the non-pinned tabs go behind the pinned tab. This behavior should be prevented and the tabs need to be arranged in a container on the right side of pinned tab.
Last Updated: 10 Jun 2021 13:29 by ADMIN


I have C# Winforms application targeting .Net 5.

I am trying to use the Raddock with the Visual Studio 2012 dark theme, adding to a radribbonform

There are several tool windows that i have tabbed using the Advance layout designer. When i try to select a tab in the main Visual studio designer i am unable to change it from the one i selected in the Advanced layout designer.

I am also unable to resize the windows using the split container while in standard design view.

I have attached a word document to try and explain.

My VS version is:


Microsoft Visual Studio Professional 2019

Version 16.9.1



Last Updated: 04 Feb 2021 13:56 by ADMIN
Release R1 2021 SP1
Please refer to the attached gif file illustrating better the missing docking guides.
Last Updated: 24 Dec 2020 11:20 by ADMIN
Created by: Dimitar
Comments: 2
Category: Dock
Type: Bug Report
To reproduce: 
See attached video.

public Form1()
    RadDockEvents.TabStripItemCreating += RadDockEvents_TabStripItemCreating;
    radDock1.AutoHideAnimation = Telerik.WinControls.UI.Docking.AutoHideAnimateMode.None;

void RadDockEvents_TabStripItemCreating(object sender, TabStripItemCreatingEventArgs args)
    if (args.AutoHide)
        var currentScale = args.TabItem.DpiScaleFactor;

        Screen showScreen = Screen.FromControl(this);
        SizeF scale = NativeMethods.GetMonitorDpi(showScreen, NativeMethods.DpiType.Effective);
        if (scale != currentScale)
            var font = args.TabItem.Font;
            var newFont = new Font(font.Name, font.Size * scale.Width, font.Style);
            args.TabItem.Font = newFont;
protected override void OnClosed(EventArgs e)
    RadDockEvents.TabStripItemCreating -= RadDockEvents_TabStripItemCreating;
Last Updated: 14 Sep 2020 12:47 by ADMIN
Release R3 2020


I am trying to make a Winforms app high dpi aware. All seems fine except when using a toolwindow on a raddock. Is there some special to setup when I want a Raddock to also autoscale?

I created a GIF to example the behaviour. The left side is at 15% and the right side just at 100%. I move the form from right to left and back. As you can see most controls get resized, except for the size of the toolwindows in the raddock.

The raddock is the only dock on the form and is set to dock in parrent. 


At the end of the gif you can see some behaviour when I place the form over both screens. Then the applications breaks. I get this error:

  Message=Fout bij het maken van de vensterkoppeling. (Translation: Error making window link.)
   at System.Windows.Forms.NativeWindow.CreateHandle(CreateParams cp)
   at System.Windows.Forms.Timer.TimerNativeWindow.EnsureHandle()
   at System.Windows.Forms.Timer.TimerNativeWindow.StartTimer(Int32 interval)
   at System.Windows.Forms.Timer.set_Enabled(Boolean value)
   at System.Windows.Forms.Timer.Start()
   at Telerik.WinControls.UI.RadFormControlBase.ScaleControl(SizeF factor, BoundsSpecified specified)
   at System.Windows.Forms.Control.ScaleControl(SizeF includedFactor, SizeF excludedFactor, Control requestingControl)
   at System.Windows.Forms.Control.Scale(SizeF factor)
   at Telerik.WinControls.UI.RadFormControlBase.HandleDpiChanged()
   at Telerik.WinControls.UI.RadFormControlBase.WndProc(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)


Maybe this is normal behaviour, but I still want to mention it, because it is possible that in an work environment, someone might to this from time to time. Maybe not on purpose, but still.

Regariding the high DPI, am I doing something wrong?




Last Updated: 04 Aug 2020 10:46 by ADMIN
Please run the sample project in an environment with left monitor at 150% DPI scaling and right monitor at 100%. You will notice that the ToolWindow remains with fixed width.
Last Updated: 28 Jul 2020 12:32 by ADMIN

To reproduce:

1. Create a floating window

2. Try to drop another window into the floating window

3. The window is successfully docked into the floating window, but DockStateChanged event does not fire.

Last Updated: 01 May 2020 08:33 by ADMIN
Release Q1 2015
Created by: Dess | Tech Support Engineer, Principal
Comments: 2
Category: Dock
Type: Bug Report
To reproduce:
1.Add a RadDock with two ToolWindows, docked in a shared TabStrip.
2.Change the dock state of the first ToolWindow to "Floating".
3.Change the dock state of the second ToolWindow to "Autohide".
4.Save the layout.
5.Change the layout.
6.Load the layout.

As a result both of the ToolWindow are autohidden.
Last Updated: 23 Jan 2020 11:53 by ADMIN
Release R1 2020 SP1 (LIB 2020_1_127)

I was already using telerik 2015 version. that was everything ok. Until I decided to upgrade to 2019 version.

I noticed that the new version is having a problem.

When RadDock Using In RightToLeft mode DocumentTabStrip Window apperance corrupted.

I uploaded sample projects for guidance.

Please help me.

My problem is acute.

Last Updated: 20 Jan 2020 12:06 by ADMIN
Release R1 2020 SP1 (LIB 2020_1_120)
Created by: Olivier
Comments: 1
Category: Dock
Type: Bug Report


I have downloaded the latest winform version today and launched my application.

I experienced an immediate crash while replacing a document container by a split container.

You can see the small piece of code and the insttruction which is causing the crash ....

Obviously it was working properly before upgrading ...

Can you help? I am now just stuck so a fix or a workaround would be useful...


Olivier D.


if (ctrlOutput == null)
                Telerik.WinControls.UI.RadSplitContainer mainSplitContainer = null;

                ctrlOutput = new ToolWindowOutput(sbOutput);

                var Output = new Telerik.WinControls.UI.Docking.ToolWindow();
                Output.Text = "Output";

                var toolTabStrip = new Telerik.WinControls.UI.Docking.ToolTabStrip();

                if (this.documentContainer1.Parent == this.radDock1)


                    this.radDock1.Controls.Remove(this.documentContainer1); <<<< CRASH HERE

                    // need to remplace document container by a split container
                    mainSplitContainer = new Telerik.WinControls.UI.RadSplitContainer();
                    mainSplitContainer.Orientation = System.Windows.Forms.Orientation.Horizontal;

                    mainSplitContainer = (Telerik.WinControls.UI.RadSplitContainer)this.documentContainer1.Parent;


Last Updated: 17 Dec 2019 15:36 by ADMIN
Release R1 2020



when drag and dropping documents in Dock layout, after some operations application crashes. Crash can be reproduce even in Dock sample from Telerik (Visual Studio Demo). Drag and drop documents into middle area, let them create more pages in one tab and then drag and drop pages to change their order. After several order changes application crashes to windows.



Last Updated: 07 Nov 2019 14:11 by ADMIN
Release R1 2020 (LIB 2019.3.1111)

If you apply one theme to the entire application and want to apply another theme for RadDock as it is demonstrated in this help article, the ThemeName property of RadDock is not respected:


        public RadForm1()

            radDock1.ElementTree.EnableApplicationThemeName = false;
            radDock1.ThemeName = "FluentDark"; 
            ThemeResolutionService.ApplicationThemeName = "Windows7"; 


Last Updated: 07 Nov 2019 14:09 by ADMIN
Release R1 2020 (LIB 2019.3.1111)

Please run the attached sample project with the latest version. You will notice that the maximized floating window is not loaded properly. This used to work in versions prior to R1 2019.

Workaround: remove "WindowState=Maximized" from the XML.

Last Updated: 04 Oct 2019 08:23 by ADMIN
Release R1 2019
Please use the project attached.

1.Run the application with multi-monitor configuration.
2.Undock toolWindow1 from RadForm1 and maximize it to the different window.
3.Close the application (the layout will be saved).
4.Run the application again.

Workaround: handle the FloatingWindowCreated event and set FormWindowState.Maximized for the floating window.

    protected override void OnLoad(EventArgs e)
      if (File.Exists(FileName))

    private void radDock1_FloatingWindowCreated(object sender, Telerik.WinControls.UI.Docking.FloatingWindowEventArgs e)
        e.Window.WindowState = FormWindowState.Maximized;
Last Updated: 04 Jun 2019 11:04 by ADMIN
Use the attached project to reproduce.

private void RadForm1_SizeChanged(object sender, EventArgs e)
Last Updated: 16 May 2019 08:57 by ADMIN
Release R1 2019
To reproduce: run the attached sample project. Click the Close button and then the Show button. You will notice that the list view is no longer available. 

Workaround: instead of using MDI, set the hostWindow.DockState = DockState.TabbedDocument; before showing the form.
Last Updated: 02 May 2019 16:07 by ADMIN
Release R2 2019

1. Add 4 ToolWindows - left, top, right, bottom. 

2. Add one DocumentWindow at the center.

3. In the Load event set the MainDocumentContainerVisible property to false. 

Please refer to the attached sample gif files. Even though the document container is not shown, the docking guides for the tabbed document are visible. 

1 2 3 4 5 6