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.)
I have a RadGalleryElement in my RadRibbonBar. It has both a minimum and maximum row count of four, and currently contains 6 items. I have "selection" enabled for the Gallery. The selection states persist for the first row of items, but do not for my second row.