Modify theme in layout preview (WYSIWYG editor) of ABAP workbench

Hi guys,

We currently plan to use bluecrystal theme on our 7.4 system.

For the ease of development I'd like to adopt the theme for the layout preview (view designer) in the ABAP Workbench. I currently see the application in corbu theme at design time which obviously differs from the application layout at runtime. Is there a way to set the theme for the WYSIWYG editor?

I remember once doing it in WDJ by copying the UR directory, maybe there is a simpler parameter setting.

thanks

Stefan