Map Editor Tile Variations

When I look at sample maps I often see tiles that are a variation of another tile (when selecting it with right click then placing it somewhere else it looks different)

I can remember there was a shortcut to do these variations (not shift)

Anyone knows the shortcut?

One tile variations are usually found in A5, otherwise they'd just be found in A2 with all the other ground autotiles.  You map them normally or with shift clicking.  There's no fancy button that says "make a variation here".  Those particular tiles are found on A2, second row, third tile over.

Unfortunatelly that XP feature wasn't transfered to VX Ace