Hello,
Thanks for writing. Yes, this is a deployment scenario we are aware of - sometimes developers do not have IIS installed on their local machines, hence the global virtual direcory ig_common used by default will not work while developing locally.
For situtations like this, we have exposed the StyleSetPath and StyleSetName properties for each control, and you can copy the ig_res folder locally in your website while developing. You can also use web.config to map that globally for all IG controls on page.
More information and this topic and different deployment scenarios are discussed in this forum thread, which I hope you will find useful:
http://forums.infragistics.com/forums/p/6462/27800.aspx#27800
Please, let me know if this helps.