Can webgui Iviews use ITS Themes generated by ITS Theme generator

Hi,

Can only IAC Components such as ESS etc be modified using ITS Theme genrator. I selected sap_preview service in the ITS Theme Generator wizard, and generated the theme.If I select webgui as the service, then it does not reflect any changes. I have an ITS Page which runs on the Portal. It does not reflect any change I have done , even when I apply the theme which was generated through SAp_preview service. Is there anything I must do to get it working.

Regards,

Harish