Bug 150347 Support binary stream as preview image.
See 144843. We need model to save binary strame as report preview image. Currently, preview image is an external image. Maybe need a type to distinguish preview image type.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/ReportDesignHandle.java
*/
	public void importCssStyles( CssStyleSheetHandle stylesheet,
			List selectedStyles )
	{
		ActivityStack stack = module.getActivityStack( );
		stack.startTrans( );
		for ( int i = 0; i < selectedStyles.size( ); i++ )
		{
			SharedStyleHandle style = (SharedStyleHandle) selectedStyles
					.get( i );
			if ( stylesheet.findStyle( style.getName( ) ) != null )
			{
				try
				{
					module.makeUniqueName( style.getElement( ) );
					addElement( style, IReportDesignModel.STYLE_SLOT );
				}
				catch ( ContentException e )
				{
					assert false;
				}
				catch ( NameException e )
				{
					assert false;
				}
			}
		}
		stack.commit( );
	}
	/**