Stage.align property sets the 0,0 coordinates of the Stage to a certain position.
For example:
Stage.align = “TL”; – sets the 0,0 coordinates to the top-left part of the Stage.
Stage.align = “CC” or Stage.align=”" – the default position is in the center of the Stage.

Stage.align property values:

Value Vertical Horizontal
“T” top center
“B” bottom center
“L” center left
“R” center right
“TL” top left
“TR” top right
“BL” bottom left
“BR” bottom right

C – use C in combination where you need to represent Center, example: CC, CL, CR…
Available from Flash 6 ^