[flexcoders] Forcing the Column Series to begin at -100 instead of zero

[vic8427]

I have a ColumnChart with the LinearAxis's minimum value set to -100 and the 
maximum 
value set to 100.  I want the columns to begin at -100 instead of at 0 (which 
would be in the 
middle of the chart) even if the value is greater than zero.  Any suggestions?