Liferay and Websphere: Problems with Widgetsets

Hello,

we are running Liferay 5.2.3 on a Websphere application server (6.1.0.23) and use Vaadin Version 6.2.3 to create our portlets.
There is a probleme with our Vaadin-Portlets that are using their own Widgetsets. After the portlets have been added to Liferay we get the error that the widgetset is not found. The Vaadin-Folder with the Themes and Widgetsets is inside the portlet and inside Liferay (…/html/VAADIN). The Widgetset is found if we run the portlet as a standalone servlet on the Websphere application server.

Thanks for your help!