flex 3 css corrupt design view

Question

when I apply a css using mx:style tag it corrupts the design view

this answer settings doesn't change anything wether I checked or not "render skins when opening a file"

is there a way to tell flex to ignore completly css in design view, or indeed let flex shows the dcss properly instead of this blue gear icon placeholder everywhere.

else, is there way to use style tag in action script instead of via mxml?

Thanks

Jean