Implicit style doesn't apply on RadRibbonTabs which are added via PRISM.

UPDATE: An implicit style can not be applied on derived controls as their TargetType is different than the one defined in the implicit style. Basically if you set the style implicitly, the style is applied only on the types that match the TargetType exactly and not on elements derived from the TargetType value. You can find more information on the topic in the remarks section of the Style property definition: http://msdn.microsoft.com/en-us/library/system.windows.style%28VS.95%29.aspx

This is why in order to apply a Telerik predefined style on a UserControl deriving from RadRibbonTab, you  need to add a Style targeting the UserControl type in the Resources of the application. It is best to define that style after merging the Telerik ResourseDictionaries so that you can base the UserControl Style on the predefined "RadRibbonTabStyle".

Allow the ApplicationMenu to be used as a stand-alone control



Available in R1 2017 Release

Edited Style of the ScreenTip does not apply when the ScreenTip is set as attached property.
Also, when you create a CustomControl deriving from the ScreenTip control, its default style is not applied.

If the height of the screen is smaller than needed the App_menu is clipped in the bottom. There are 5-10 px wrong in calculation

Expose an IsActiveChanged event for the ContextualGroups

Will be available in Q1 2015 Release.

When you click on a control in the DropDownContent of a RibbonSplitButton, a click is registered in the underlying control (behind the DropDownContent).

Allow hiding the tab headers - when a single tab is displayed a tab header is not needed and it can be programmatically hidden in order to save space.

UPDATE: HeaderVisibility property can be used to achieve this behavior

Allow changing the entire UpDownButton tooltip.

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

Add ScreenTip for the Application Button

UPDATE: RibbonView ApplicationButtonStyle property  can be used to apply a style on the ApplicationButton. Use the style to apply a ScreenTip on the button.

The screentip should allow binding to text, image

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.

System.InvalidOperationException is thrown in the VS designer in a view defining a RadRibbontab control.

When a style is applied on the QAT, changing its position opens its popup menu unexpectedly. The style doesn't have to be customized, the issue is reproducable with the default OfficeBlack style of the control.

When a view doesn't specify DesignHeight/Width, the RibbonView throws design-time exception if it contains ContextualGroups.

Change the ApplicationButton ControlTemplate so that the button Width can be easily customized.

UPDATE: RibbonView ApplicationButtonStyle property  can be used to apply a style on the ApplicationButton. Use the style to apply a Width on the button.

Currently only the Left Key activates the key tips.