Rolling 3-Month Line-Graph

[#1]

I have a Line-Chart wit Cycle a-Group (Monthly, 3-Monthly, 12-Monthly) Dimensions,

suppose I choose 3-Monthly, the Line-Chart should scroll in a 3-Month Portion and if I choose a month (from month 1 to 2) it shall shift one month.

In the X-Axis for month 1 it should be labeld as:

2008-M01, 2008-M04, 2008-M07, 2008-M10, 2009-M01, 2009-M04 etc.

if I choose month 2 it should be labeled as

2008-M02, 2008-M05, 2008-M08, 2008-M11, 2009-M02, 2009-M05 etc.

if I choose month 3 it should be labeled as

2008-M03, 2008-M06, 2008-M09, 2008-M12, 2009-M01, 2009-M06 etc.

etc.

That means it has nothing to do with the static calendar-quarter

Any ideas?