eclipse RCP - Birt integration

I have configured my plugin.xml dependencies with org.eclipse.birt.report.viewer and added the following code to my app.

Browser browser = new Browser( parent, SWT.NONE );
WebViewer.startup( browser );
WebViewer.display("C:/testproject/birt.rptdesign", WebViewer.HTML, true);

What does I have forgotten?



--edit
If I have a runconfig with all plugins selected, it functions. Which plugins are in minimum required?