Last Updated: 14 Sep 2023 14:58 by Martin Ivanov

The ScreenTip no longer is displayed on mouse over of the owner element. This reproduces only if the element is hovered before the ScreenTips of the previously hovered element is closed. In other words this happens if the two elements that contain ScreenTips are overlapping are very close to one another and there is no space that allows closing the tooltip while moving the mouse.

To work this around, subscribe to the Opened event of the ScreenTip control and set its Visibility to Visible if the element was previously Collapsed.

	<Style TargetType="telerik:ScreenTip">
		<EventSetter Event="Opened" Handler="ScreenTip_Opened" />


private void ScreenTip_Opened(object sender, RoutedEventArgs e)
	var screenTip = (ScreenTip)sender;
	if (screenTip.Visibility == Visibility.Collapsed)
		screenTip.Visibility = Visibility.Visible;

Last Updated: 28 Aug 2023 07:25 by ADMIN
Release LIB 2023.2.904 (4 Sep 2023)

Setting the LayoutMode to Simplified doesn't do anything in the RadRibbonTabs that are assigned to a RadRibbonContextualGroup.

To work this around, extract the "ContextualTabsTemplate" ControlTemplate and the following elements in the "RibbonScrollViewer".


<telerikRibbonViewPrimitives:RibbonScrollViewer x:Name="TabItemsScrollViewer">
		<ItemsPresenter x:Name="PART_DefaultItemsPresenter" HorizontalAlignment="Left" />
		<ItemsControl x:Name="PART_SimplifiedItemsControl" Visibility="Collapsed" 
				  ItemsSource="{Binding SimplifiedItems, RelativeSource={RelativeSource TemplatedParent}}">
					<telerikRibbonViewPrimitives:RibbonGroupsPanel />


Then define the following DataTrigger in the ControlTemplate.Triggers collection:


<DataTrigger Binding="{Binding RelativeSource={RelativeSource AncestorType=telerikRibbonView:RadRibbonView}, Path=LayoutMode}" Value="Simplified">
	<Setter TargetName="PART_SimplifiedItemsControl" Property="Visibility" Value="Visible"/>
	<Setter TargetName="PART_DefaultItemsPresenter" Property="Visibility" Value="Collapsed"/>


Then, assign the custom ControlTemplate via the Template property of RadRibbonTab.


<telerik:RadRibbonTab Template="{StaticResource CustomContextualRibbonTabTemplate}" />


Last Updated: 25 Aug 2023 16:55 by Martin Ivanov

The RadRibbonWindow titlebar is higher than expected when the Windows 11 theme is used. 

A side effect of this is that the content overlaps the titlebar, when the content is not a RadRibbonView. 

This reproduces when the Windows11 and Crystal themes are used. To reproduce it, the IsWindowsThemeEnabled property should be set to false in order for the Telerik theme to get applied to the window.

To work this around, you can use the visual tree helper methods in the Loaded event of RadRibbonWindow in order to get the corresponding visuals and change their size and offset.

private void RadRibbonWindow_Loaded(object sender, RoutedEventArgs e)
	var windowDecoratorPanel = this.ChildrenOfType<Grid>().FirstOrDefault(x => x.Name == "MaximizeWindowDecorator");
	var titleBarPanel = windowDecoratorPanel.FindChildByType<Grid>();
	titleBarPanel.RowDefinitions[0].Height = new GridLength(30);

	var clientArea = windowDecoratorPanel.ChildrenOfType<Border>().FirstOrDefault(x => x.Name == "PART_ClientAreaBorder");
	clientArea.Margin = new Thickness(0);

Last Updated: 15 Aug 2023 11:34 by Helen
RadRibbonDropDownButton with Table Picker freezes UI after picking a table.
Last Updated: 11 Jul 2023 11:05 by ADMIN
Release R2 2023
Currently, when the users hover around the window's border, the resizing border is 1 pixel wide. Create the border wider (higher at top and bottom borders).
Workaround: Apply right margin to the content inside the window.
Last Updated: 25 May 2023 13:36 by ADMIN
Reproduces when you add the ContextualGroups in code-behind. While resizing the RibbonWindow the Ribbon Title overlaps the ContextualGroup Header. 
Last Updated: 25 May 2023 13:36 by ADMIN
When there are enough items in a RibbonBackstageItem for the ScrollBar to appear, it is clipped by the RadRibbonWindow's header.

1. Extract the templates for RadRibbonBackstage and ScrollViewer
2. Refer the new template for the ScrollViewer in the template for the RadRibbonBackstage.
3. Change the margin for the PART_VerticalScrollBar from 0, -1, -1, -1 to 0, 27, -1, -1.
4. Set the new ControlTemplate to the RadRibbonBackstage in the application.
Last Updated: 13 Apr 2023 10:35 by ADMIN
Release LIB 2023.1.424 (24 Apr 2023)

NullReferenceException is thrown on start up of the application, when the IsMinimized property of RadRibbonView is set to True initially. For example, if you set it in XAML.

To work this around, set the IsMinimized property in the Loaded event handler of RadRibbonView.

private void RadRibbonView_Loaded(object sender, System.Windows.RoutedEventArgs e)
	var ribbonView = (RadRibbonView)sender;
	ribbonView.IsMinimized = true;


Last Updated: 11 Apr 2023 17:44 by ADMIN
In XP and Windows10, the window goes behind the windows task bar when it is maximized.
The problem manifests itself if we set explicitly the "WindowStyle" property of the RadRibbonWindow.
With its "default" value, the problem do not exists.
It is also reproduced when AllowTransparency = True (it requires WindowStyle = None), which is needed to set a drop shadow effect.
Last Updated: 12 Jan 2023 18:22 by ADMIN
The window state of the RadRibbonWindow cannot be changed on double click over the titlebar, when you click under the middle of the title bar. The same issue occurs when you try dragging the title from this position. The issue is more noticeable when the window is maximized.
Last Updated: 08 Sep 2022 09:57 by ADMIN
Release R3 2022
This is reproducible only if the application that holds RadRibbonView is started on another machine and you are connected to it through Remote Desktop Connection. When the keytips are enabled and you click in the main machine, then click inside the remote desktop window, the keytips are displayed.
Last Updated: 27 Jun 2022 06:15 by ADMIN
Release LIB 2022.2.627 (27 June 2022)
When the dropdown popup of the RadRibbonDropDownButton or RadRibbonSplitButton is opened, the ApplicationMenu is not resized, in order to fit the dropdown items.
Last Updated: 31 May 2022 06:18 by ADMIN
Release LIB 2022.2.530 (30 May 2022)

If you add the RibbonView into the Content of a TabItem (or RadTabItem) and then remove it from the content, the RibbonView is still in the memory. 

This happens because we subscribe to few events of the Parent window on Loaded and unsubscribe on Unloaded. However, because of the specific content loading behavior of TabControl, Loaded of the content (the RibbonView) is fired once and Unloaded only once.

To work this around, before removing the RibbonView from the TabItem, call its OnUnloaded event handler. To do this, you can use a reflection to get the handler and then invoke it.

var methodInfo = typeof(RadRibbonView).GetMethods(System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic).Where(m => m.Name == "OnUnloaded").First();
methodInfo.Invoke(ribbon, new object[2] { null, null });

Last Updated: 22 May 2022 21:10 by ADMIN
Release LIB 2022.2.523 (23 May 2022)
When the Visibility of the RadTabItem is set to Collapsed the keyboard navigation does not work as expected. 
Last Updated: 29 Nov 2021 12:27 by ADMIN
Release LIB 2021.3.1129 (29 Nov 2021)
When the Windows OS auto-hide taskbar feature is enabled, the RadRibbonWindow is clipped and offset on the top and left sides. This reproduces only if the window is maximized initially. Changing its state afterwards resolves the visual glitch. Also in order to recreate this the IsWindowsThemeEnabled property should be set to False, in order for the ribbon window to use its Telerik theme, instead of the Windows one.
Last Updated: 28 Oct 2021 11:39 by ADMIN
Release LIB 2021.3.1101 (1 Nov 2021)
In the Quick Access Toolbar drop-down part, navigating the items while pressing the Up/Down arrow keys will Highlight all items.
Last Updated: 01 Oct 2021 07:16 by ADMIN
Release LIB 2021.3.1004 (4 Oct 2021)
The content of RadRibbonWindow is positioned wrongly when the Windows taskbar auto-hiding is enabled. This happens on Windows 10.
Last Updated: 01 Sep 2021 10:47 by ADMIN
Release LIB 2021.1.426
The popup is no properly sized when you have two or more monitors with different resolutions. This is replicable also if the DPI is higher than 100%.

To work this around you can create a custom ribbonview, get the content presenter of the popup and manually set its Width. Here is an example in code:

public class CustomRibbonView : RadRibbonView
	private ContentPresenter selectedTabContentPopup;

	public override void OnApplyTemplate()
		this.selectedTabContentPopup = this.GetTemplateChild("SelectedTabContentPopup") as ContentPresenter;

	protected override void OnMinimizedPopupStateChanged(RadRoutedEventArgs e)
		if (this.IsMinimizedPopupOpen)
			this.selectedTabContentPopup.Width = this.ActualWidth;
Last Updated: 20 Jul 2021 09:42 by ADMIN
Output error in VS:

System.Windows.Data Error: 4 : Cannot find source for binding with reference 'RelativeSource FindAncestor, AncestorType='Telerik.Windows.Controls.RadRibbonView', AncestorLevel='1''. BindingExpression:Path=IsHostedInRibbonWindow; DataItem=null; target element is 'WindowTitle' (Name='WindowTitle'); target property is 'NoTarget' (type 'Object')
Won't Fix
Last Updated: 14 Jul 2021 14:22 by ADMIN
The designer of VS crashes with a "Key cannot be null" when custom markup extension is used in Style Setter. This reproduces in the sample app attached in the blog (http://www.telerik.com/blogs/bring-office-2016-inspired-style-to-your-app-with-ui-for-wpf) on the TextBlock of the RabRadioButton HeadingStyle (snapshot attached) if you open MainWindow in Designer. Runtime everything works as expected.
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