The documentation for Bullet Graphs indicates that you can specify a color for each color item in the ColorRange, i.e., the following XML is given as an example: 
<chart lowerLimit='0' upperLimit='100' caption='Revenue' subcaption='US $ (1,000s)' numberPrefix='$' numberSuffix='K' showValue='1' > 
   <colorRange> 
	  <color minValue='0' maxValue='50' color='A6A6A6'/> 
	  <color minValue='50' maxValue='75' color='CCCCCC'/>  
	  <color minValue='75' maxValue='100' color='E1E1E1'/>  
   </colorRange>  
   <value>78.9</value> 
   <target>80</target> 
</chart> 
However, modifying the color attribute for a color item in the ColorRange does not have any affect on the chart colors.  Is this a bug in the Bullet Graph or a bug in the documentation? 
Thanks 
Patty