Bug 179743 Parameter Validate Event is not Called
I have tested the validate event on parameters and it never appears to get called.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/api/impl/EngineTask.java
executionContext.setReportContext( new ReportContextImpl(
				executionContext ) );
		setReportRunnable( runnable );
		
		executionContext.setAppContext( engine.getConfig( ).getAppContext( ) );
		cancelFlag = false;
		runningStatus = STATUS_NOT_STARTED;
	}
	protected EngineTask( IReportEngine engine, IReportRunnable runnable,
			int taskType )
	{
		this( engine, runnable );
		this.taskType = taskType;
	}
	/**
	 * @return Returns the locale.
	 */
	public Locale getLocale( )
	{
		return locale;
	}
	/**
	 * @return Returns the ulocale.
	 */
	public ULocale getULocale( )
	{
		return ULocale.forLocale( locale );
	}
	/**
	 * sets the task locale