use radRibbonBar1.BackstageControl.Hide(); to observe the issue.

Metro theme for RadRibborBar has glitches for the application menu and quick access bar.

Incorrect layout when clearing and adding new items with controls in their Page to the BackstageView at run time.

Steps to reproduce.

1. Add a form with a RadRibbonBar 
2. Add a RadCheckBox to the ribbon
3. Set the IsThreeState property of the check box to true
4. Run the project and click through the states of the check box. You will see that the checked and indeterminate states are looking the same way.

To reproduce add ten items to the drop down and on the click event of some of them collapse seven of the items.

BackstageView changes its location when it is opened on a RadRibbonForm and the form gets maximized.

Pressing the ALT key should displays the Key Tips and moves keyboard focus to the RadRibbonBar by pressing any of the typical keyboard navigation key (i.e., TAB, SHIFT+TAB, ARROW RIGHT, ALT+ARROW, DOWN, SPACE BAR, etc.)

RadRibbonForm with RadPageView in Backstage view mode. Unexpected menu for adding items in a RadRibbonBar group appears (quite randomly) while clicking on the RadPageView page items.

FIX. RadRibbonBar - the items text disappears on minimize and maximize.

FIX. RadRibbonBar - the RightToLeft property of the ribbon itself it not synchronized with the same property of the Popup of the RibbonBarElement

FIX. RadRibbonBar - CommandTabSelected event is fired twice

FIX. RadRibbonBar - when a form with the ribbon bar is constantly resized, the application memory is also contactly increased and never released.
Comment: actually the memory leak occurs because of RasStatusStrip

ADD. RadRibbonBar - add cancelable CommandTabChanging event.
The event is called CommandTabSelecting to be coherent with the older event CommandTabSelected.

Setting the Visibility property of QuickAccessToolBar to collapsed results in collapsed RadRibbonBar TitleBar.

When you set padding to the Backstage View and then undo this by pressing Ctrl+Z, the setting is reset, but the control is not updated.

When a Backstage View is opened for the first time and the Enter key is pressed, null reference exception is thrown.

Enable duplication of RadRibbonBar group's element.

Once elements are added to RadRibbonBar and the designer is closed and reopened, elements from RadRibbonBar cannot be selected.

FIX. RadRibbonForm title bar buttons location is misplaced.