Bug 146790 Help text/help text key for cascading parameter group is not supported
Steps to reproduce: 1.New a cascading parameter group 2.Switch to Properties, select the cascading parameter group 3.Set help text to "helpme" 4.Preview Expected result: Help text appears when hovering over the cascading parameter group name in Parameter input dialog Actual result: Help text/help text key is not supported
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/service/BirtViewerReportService.java
List ret = new ArrayList( );
		for ( Iterator it = params.iterator( ); it.hasNext( ); )
		{
			Object o = it.next( );
			if ( o instanceof ParameterGroupDefinition )
			{
				ParameterGroupDefinition group = (ParameterGroupDefinition) o;
				ret.addAll( group.getParameters( ) );
			}
			else
				ret.add( o );
		}
		return ret;
	}
	private static List convertParametersInGroup( Collection scalarParameters,
			ParameterGroupDefinition group, IGetParameterDefinitionTask task )
	{
		if ( scalarParameters == null )
			return null;
		List ret = new ArrayList( );
		for ( Iterator it = scalarParameters.iterator( ); it.hasNext( ); )
		{
			IScalarParameterDefn engineParam = (IScalarParameterDefn) it.next( );
			ParameterDefinition param = convertScalarParameter( engineParam,
					group, task );
			ret.add( param );
		}
		return ret;
	}
	private static ParameterGroupDefinition convertParameterGroup(