Under ultrawebgrid 20073 the css with some cautions on the css classes order and !important keyword in css was working, after upgrade to 20091 css classes behave bad.
Anybody had experienced something like this ?
OptimizeCSSClassNamesOutput="False" in DisplayLayout can avoid the problem.
Without this, some styles for whole hierarchies like - TBODY.ig_css123456 TR TH are integrated with styles assigned to the grid on the top level of hierarchy but styles assigned to the grid knows nothing about the rest of it.
After some experiments it seems to be more general problem.
If in the ultrawebgrid css classes are used the rendering will fail, but in the visual studio design mode.
see the picture