Comes from ticket 371813;

1)Create a form with RadRibbonBar, RadDock with some (3) windows, set key tips to the RibbonBar and run the form.
2) Hold and release the Alt key. The numbers show up on the ribbonbar as expected.
3) Click somewhere but not on the tabdocument to turn off the numbers ( notice that the initial tab will be "documentWindow1")
4) click on "documentWindow3" to select it
5) press the the Alt key again. The tabs will switch back to "documentWindow1" !!!