If you place a TextBlock in the QuickAccessToolbar and the Ofice_Black theme is applied you get black foreground on black background which makes the text unreadable. The content of the QAT must respect the theme applied to the RadRibbonView control.

If a RibbonView is used in a WPF, where the Window SizeToContent property is set to WidthAndHeight, the Window takes too much space.

Available in LIB version: 2016.3.1212

There are three errors for missing icons when implicit themes are used:
Resource '/Telerik.Windows.Controls.RibbonView;component/HelpIcon.png' was not found.
Resource '/Telerik.Windows.Controls.RibbonView;component/RibbonGalleryCollapsedIcon.png' was not f

There is a flickering when the active ContextualGroup is changed - the RibbonView first selects the non-contextual main tab before it switches to the according contextual tab. The flickering can't be observed every time.

Open the Application menu.
Open one of its submenus.
Hover another button.

The opened submenu will not close.

Available in LIB version: 2016.3.1017

Cite:
The problem is displaying ScreenTip for Application Button.
Move the mouse on Application Icon, no tooltip shows.
Click it to show the list of menus and go to the first item.
The ToolTip shows up under the menu.

Available in LIB version: 2014.3.1312

RibbonWindow throws a TypeInitializationException when used with VSTO Addin

It is impossible to prevent the application menu from closing.

Note:  The ApplicationMenuOpenStateChanged event of the RadRibbonView could be used to prevent closing of Application menu. This approach is demonstrated in the attached project.

Cannot define an event handler for the RibbonButton.HoverEvent in code-behind


Available in LIB version: 2014.3.1222

The screentip should allow binding to text, image

The ScreenTip isn't displayed unless you define its Title property

Currently the Backstage support keyboard navigation only if the the RadBackstageItems have their IsSelectable property set to true. The keyboard support should be extended to support BackstageItems that have IsSelectable=false.

Will be available in Q2 2015 Release.

RibbonGroup containes many TextBoxes with TabIndices set. HyperLink with TextBlock inside is between the TextBoxes. TextBlock Text is "" or x:Null.
Tabbing is possible only between the TextBoxes on the left of the Hyperlink.

VS Designer trows exceptions if a RibbonTab is placed in a UserControl:  

If the RibbonTab control size isn't defined, the designer throws a System.InvalidOperationException - FrameworkElement_LayoutMeasure_InfinityNaNReturned.  

If the RibbonTab size is set, then clicking on the tab in the designer raises a System.ArgumentException - Property 'Items' was not found in the property collection 'Grid'. 

Currently only the Left Key activates the key tips.

The RibbonTabStrip does not collapse when Application Button is Collaps as well as the RibbonTabs.
This works in RibbonBar.

Available in LIB version: 2014.3.1402

The RibbonGroup displays a white border on mouse over around its Image element when the group is in collapsed state when a Windows8 theme is applied.

Setting Button, TextBlock, TextBox or any other UI Element as a Header of RadRibbonGroup produces a runtime exception: The Element is Already Child of another visual.

The RibbonView ContextualGroup is not redrawn when a new RadTabItem is added dynamically and the ContextualGroup is currently active.