Last Updated: 05 May 2021 11:57 by ADMIN
Setting the dpiAware attribute to True in the app.manifest file is making the WPF application DPI aware. In this case, the resizing of RadWindow doesn't work properly on two monitors with different DPI scale factors.
Last Updated: 07 Apr 2021 10:38 by ADMIN


Please see attached project,

After use animation changed window size and use the mouse to drag to change the size of the window,

When the window size is smaller than the original size, the upper right button will be hide,

Original WPF Window no this problem, And changing size animation very Smooth then RadWIndow.

Last Updated: 30 Mar 2021 11:30 by ADMIN
We can expose a property/ies to easily customize the header border of the window.
Last Updated: 24 Mar 2021 13:03 by ADMIN

If you open the window on a specific resolution, maximize it and then change the resolution to a bigger one, the window size is not updated. The window stays in the original resolution of the screen.

To work this around subscribe to the SystemEvents.DisplaySettingsChanged event and reset the WindowState of RadWindow.

public MainWindow() // where MainWindow is RadWindow
	SystemEvents.DisplaySettingsChanged += SystemEvents_DisplaySettingsChanged;

private void SystemEvents_DisplaySettingsChanged(object sender, EventArgs e)
	if (this.WindowState == WindowState.Maximized)
		this.WindowState = WindowState.Normal;
		this.WindowState = WindowState.Maximized;

Last Updated: 09 Mar 2021 12:29 by ADMIN
Release LIB 2021.1.315
ArgumentOutOfRangeException can be thrown when showing/closing windows in a multi-threaded application. Here's a possible stack trace:

System.ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index
   at System.ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument argument, ExceptionResource resource)
   at System.ThrowHelper.ThrowArgumentOutOfRangeException()
   at System.Collections.Generic.List`1.RemoveAt(Int32 index)
   at System.Collections.Generic.List`1.Remove(T item)
   at Telerik.Windows.Controls.RadWindowManager.RemoveWindow(WindowBase window)
   at Telerik.Windows.Controls.WindowBase.OnClosed()
   at Telerik.Windows.Controls.RadWindow.OnClosed()
   at Telerik.Windows.Controls.WindowBase.CloseHostImidiately()
   at Telerik.Windows.Controls.WindowBase.TryClose(Boolean shouldCloseHost)
   at Telerik.Windows.Controls.WindowBase.Telerik.Windows.Controls.InternalWindow.IWindowDragAware.TryClose(Boolean shouldCloseHost)
   at Telerik.Windows.Controls.InternalWindow.WindowWithNoChromeWindowHost.OnWindowClosing(Object sender, CancelEventArgs e)
   at System.Windows.Window.OnClosing(CancelEventArgs e)
   at System.Windows.Window.WmClose()
   at System.Windows.Window.WindowFilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   at System.Windows.Interop.HwndSource.PublicHooksFilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
   at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
   at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)
   at System.Windows.Threading.Dispatcher.WrappedInvoke(Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)
   at System.Windows.Threading.Dispatcher.LegacyInvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs)
   at System.Windows.Threading.Dispatcher.Invoke(DispatcherPriority priority, Delegate method, Object arg)
   at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam)
Last Updated: 10 Feb 2021 13:39 by ADMIN
Last Updated: 10 Feb 2021 13:39 by ADMIN
Created by: Rob A.
Comments: 2
Category: Window
Type: Feature Request

There should be an easy method to add/override the shadow of a RadWindow. Either via XAML attributes or code behind.

It would probably be good to allow the override of BlurRadius, Direction, and ShadowDepth.
For example (mockup):

<telerik:RadWindow x:Class="MyRadWindow"
        Header="Settings" WindowStartupLocation="CenterOwner" SizeToContent="True" ResizeMode="NoResize" MinWidth="500" MaxWidth="900"    DropShadowOverride="True" DropShadowOverrideBlurRadius="10" DropShadowOverrideDirection"-90", DropShadowOverrideDepth="3" DropShadowOverrideColor="White">
    <!-- UI code -->

Last Updated: 01 Feb 2021 06:16 by ADMIN
Release LIB 2021.1.201 (2/1/2021)
Last Updated: 17 Nov 2020 10:39 by ADMIN
As an example Windows 10 OS Window gets different Opacity for its Title and Buttons when Inactive (open two Window-s and make them appear one behind the other -- the one in the background of the active window is inactive). Our Office2016 and Office2016 Touch themes are inspired by Windows 10 OS as we officially stated so we might mind adding this visual appearance on our side for RadWindow.
Last Updated: 05 Nov 2020 15:12 by ADMIN
Release LIB 2020.3.1109 (11/09/2020)
Changing the ResponseButton through the DefaultFocusedButton property of the DialogParameters does not work in the Office2019 theme.
Last Updated: 30 Sep 2020 15:00 by ADMIN
Release LIB 2020.3.1005 (10/05/2020)
Created by: Kalin
Comments: 1
Category: Window
Type: Feature Request
The property is present, but it is not implemented. 
Last Updated: 21 Sep 2020 10:56 by ADMIN
Release LIB 2020.3.921 (09/21/2020)
This behavior can be observed when the ResizeMode property of RadWindow is set to CanResizeWithGrip. 
Last Updated: 02 Sep 2020 08:12 by ADMIN
The window is not correctly resized when it is maximized and the taskbar is moved from vertical to horizontal or vice versa 
Last Updated: 17 Aug 2020 12:24 by ADMIN
Release LIB 2020.2.617
This could appear on virtualization systems like Citrix and Systancia. The exception appears in the TaskbarHelper.GetAppBarData() method.
Last Updated: 10 Jun 2020 13:32 by ADMIN
Release R2 2020 SP1

If the autohiding feature of the taskbar is enabled and RadWindow is maximized, the taskbar is not displayed when the mouse is over the bottom of the screen.

This is observed also in RadTabbedWindow.

Last Updated: 20 Jan 2020 07:21 by ADMIN
Release LIB 2020.1.120 (1/20/2020)



I've found a new bug regarding per-monitor DPI awareness in the latest WPF controls build (2020.1.115).

Applications start fine on the modern Windows 10 systems (1607 or later) but crash on previous Windows versions.

The conditions to reproduce:

  • The application is launched on Windows version older than Windows 10 1607/Windows Server 2016. I've reproduced it on Windows 8.1/Windows Server 2012 R2, but I suppose it also affects Windows 10 1507/1511, and probably Windows 8/Windows Server 2012.
  • Application manifest contains:
<dpiAware xmlns="http://schemas.microsoft.com/SMI/2005/WindowsSettings">true/PM</dpiAware>

Here is the stack trace:

System.EntryPointNotFoundException: Unable to find an entry point named 'GetDpiForSystem' in DLL 'User32.dll'.

   at Telerik.Windows.Controls.InternalWindow.Standard.NativeMethods.GetDpiForSystem()

   at Telerik.Windows.Controls.InternalWindow.Standard.DpiHelper.GetSystemScaleFactor()

   at Telerik.Windows.Controls.InternalWindow.Standard.DpiHelper.CalculateScaleFactor(IntPtr hwnd)

   at Telerik.Windows.Controls.InternalWindow.Standard.DpiHelper.GetPerMonitorDPIAwareScaleFactor(IntPtr hwnd)

   at Telerik.Windows.Controls.InternalWindow.ChromelessWindowHelper.<Initialize>b__81_0(Object sender, EventArgs args)

   at System.Windows.Window.OnSourceInitialized(EventArgs e)

   at System.Windows.Window.CreateSourceWindow(Boolean duringShow)

   at System.Windows.Window.CreateSourceWindowDuringShow()

   at System.Windows.Window.SafeCreateWindowDuringShow()

   at System.Windows.Window.ShowHelper(Object booleanBox)

   at System.Windows.Window.Show()

   at Telerik.Windows.Controls.InternalWindow.WindowWithNoChromeWindowHost.Open(Boolean isModal)

   at Telerik.Windows.Controls.WindowBase.ShowWindow(Boolean isModal)

   at Telerik.Windows.Controls.RadWindow.Show()

   at TelerikWpfCrash.App.OnStartup(StartupEventArgs e) in C:\Users\fedarovich\source\repos\Test\TelerikWpfCrash\TelerikWpfCrash\App.xaml.cs:line 20

The issue happens because the code calls the WinAPI functions not available on these OS versions (for example, GetDpiForSystem, but maybe there are more). 

I've attached a small example to reproduce this issue. It is for .Net Core 3.1, but the same issue exists in .Net Framework too.

Last Updated: 17 Jan 2020 15:26 by ADMIN


   There is a bug in version 2019.3.1023.45 RadWindow when I minimum and restore window from task bar

Last Updated: 25 Nov 2019 10:00 by ADMIN
Release LIB 2019.3.1125 (11/25/2019)
This exception is thrown when the CanExecute method of the Command bound to a response button returns false when the response button key is pressed. 
Last Updated: 13 Nov 2019 15:50 by ADMIN
Release LIB 2019.3.1118
The Window doesn't resize correctly when dragged from the primary monitor (with taskbar) and docked to the top of the screen of a secondary monitor (no taskbar) in order to maximize it and "Show window contents while dragging" Windows system setting is disabled.
Last Updated: 11 Nov 2019 14:13 by ADMIN
When creating themed applications using RadControls, the standard Windows MessageBox control looks out of place.  With that in mind, the predefined RadWindows (Alert and Confirm) seem to be natural replacements for a typical MessageBox.  

However, when these dialogs open, they are silent  That is, they don't play any error, warning, or question sounds like the standard MessageBox - which makes them seem "strange" when used as a replacement.

Adding sounds to (for instance) the Alert window is fairly simple and can be accomplished like this:

RadWindow.Alert(new DialogParameters()
    Content = new System.Windows.Controls.TextBlock {
        Text = ex.Message, Width = 250, TextWrapping = TextWrapping.Wrap },
    Header = "Update Error",
    Opened = (alertDialog, eventArgs) => System.Media.SystemSounds.Exclamation.Play()

Though, it'd be nice if the ability to play a sound was built-in.  I'd suggest that the DialogParameters class used to customize the predefined dialogs be extended to support a SystemSound member of type System.Media.SystemSounds which, if defined, would play the specified sound when the dialog opens.
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