Bug 148755 Add tthe status to the ActivityStackEvent.
If the the event rollback, the ActivityStackEvent status should be ROLL_BACK.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/activity/ActivityStack.java
startSilentTrans( null, false );
	}
	/**
	 * Starts a silent transaction. All events in the trasaction will not be
	 * sent out.
	 * 
	 */
	public void startSilentTrans( boolean filterAll )
	{
		startSilentTrans( null, filterAll );
	}
	/**
	 * Starts a silent transaction. All events in the trasaction will not be
	 * sent out.
	 * 
	 * @param label
	 *            localized label for the transaction
	 */
	protected void startSilentTrans( String label, boolean filterAll )
	{
		boolean outerMost = true;
		if ( !transStack.isEmpty( )
				&& transStack.peek( ) instanceof LayoutCompoundRecord )
			outerMost = false;
		transStack
				.push( new LayoutCompoundRecord( label, outerMost, filterAll ) );
	}
	/**
	 * Starts a filter events transaction, all the events within the transaction
	 * will be held. They will be filtered and sent out once the transaction is