The best way to learn which number between 0 and 255 corresponds to which hue will be experimentation.
The thing to keep in mind is that we are dealing with a hue shift here, so it matters very much what color your object is to begin with. I have found it very helpful to make almost all my stuff red and use this as what I call zero.
I chose this because if you right click on a widget and select properties the Hue Shift slider displayed therein starts and wraps back to red. That color bar there provides a rough idea of what shift you'll need to make a red item blue, for example.
Notice that yellow is underrepresented, so starting with a standard base color and sticking to it will really help you when you want to set a specific color--just saves time vs. trying different values.
If you download my Blister Pack DX widget, there is a slider which displays the number for Hue shift, and everything starts as Red=0, so there's a handy way to figure out some closer values for your project. http://rabidrobot.wincustomize.com/ViewSkin.aspx?SID=6935&SkinID=892&LibID=34&comments=1
Another thing you can use to help you narrow down the range is a color wheel. http://images.google.com/images?q=color+wheel
With a color wheel you can find the current color of your object, and kinda guesstimate how far around you need to go to get to the desired color. Of course, you'll have to do some extra math converting the 0-360 degree circle to a 0-255 value shift.
Hope that helps!
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