Expose property controlling the RibbonGroups Header Background

RibbonBar should set default GroupNames of the RadRadIoButtons used

The constructor of the GroupVariantCollection is internal

Reason for declining: The RadRibbonGroup uses the GroupVariantCollection internally and as there is no public property of type GroupVariantCollection there is not need for the constructor to be exposed. Also if the users wants to bind the Variants of the RadRibbonGroups they can use the VariantsSource property which is of type IEnumebable<GroupVariant>.

In SL this scenario is only in OOB mode, with BorderlessRoundCorners.

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

When the DropDownButton in an ApplicationMenu is clicked, the DropDown area should not be closed (see MS Excel for reference).

RibbonGroup collection can be populated only w/ buttons from the designer

QAT should have overflow

Currently, Title and Description properties are typed to string and the control template uses TextBlock controls to display these properties, I think that only typing these properties to "object", showing them with  ContentPresenters and adding a pair of DataTemplate Dependency properties (TitleTemplate and DescriptionTemplate) would offer an extremely flexibility to this useful control.

Declined: If the users need to transfer object data to the ScreenTip they could use the Tag property(http://msdn.microsoft.com/en-us/library/system.windows.frameworkelement.tag%28v=vs.110%29.aspx)  and bind its value to an custom Implicit style targeting the ScreenTip. 

Make the gallery resizable

Make Buttons' Image properties of Object type.

Any group or button can be right clicked and added to the Quick Access Toolbar (QAT).

Expose properties to control the BackstageItem.Icon size

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

Allow ApplicationMenu to be editable in Blend. Make sure when clickon the application button the app menu is displayed in blend. Also add panels for the content and footer content for easier content adding.

The screentip should allow binding to text, image

The MinimizedPopup could be open/closed by using the SelectedIndex property of the RadRibbonView.

A sample implementation could be seen in the attached project.

Add a property to show/hide RibbonWindow Close/Minimize/Restore buttons panel

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.

Add support for direct content of ribbon buttons (like using XAML vector graphics instead of images).