Bug 140754 Can't turn to the right station when use drill-through
Details: Can't turn to the right station when use drill-through Step: 1.New a report design named R1. 2.Add two label. 3.Add page break and set the bookmark as "a" on the second label. 4.New another report design named R2. 5.Add a label in R2 and set the hyperlink to R1-"a". Actual result: Preview R2 and click the hyperlink. I find that it only open R1, but turn to the state of the second label.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/api/HTMLActionHandler.java
{
					url = "#" + actionDefn.getActionString( );
				}
				break;
			case IAction.ACTION_HYPERLINK :
				url = actionDefn.getActionString( );
				break;
			case IAction.ACTION_DRILLTHROUGH :
				url = buildDrillAction( actionDefn, context );
				break;
			default :
				assert false;
		}
		return url;
	}
	/**
	 * builds URL for drillthrough action
	 * 
	 * @param action
	 *            instance of the IAction instance
	 * @param context
	 *            the context for building the action string
	 * @return a URL
	 */
	protected String buildDrillAction( IAction action, Object context )
	{
		String baseURL = null;
		if ( context != null && context instanceof HTMLRenderContext )
		{
			baseURL = ( (HTMLRenderContext) context ).getBaseURL( );