Bug 201042 [Accessibility]Chart scritp should not add by auto when click the down in keyboard[17]
Description: Chart scritp should not add by auto when click the down in keyboard[0704] Step: 1. New a chart and switch to script view. 2. Let the point on the script function selection. 3. Click the down on keyboard. Actual result: A function will add by auto. Expected result: Customer can not select the function under the second function by keyboard, and it should not be added by auto.
chart/org.eclipse.birt.chart.ui.extension/src/org/eclipse/birt/chart/ui/swt/composites/TriggerDataComposite.java
( (SeriesValue) value ).setName( "" ); 
				break;
			case INDEX_7_TOOGLE_DATAPOINT :
				value = AttributeFactory.eINSTANCE.createSeriesValue( );
				( (SeriesValue) value ).setName( "" ); 
			default :
				break;
		}
		Action action = ActionImpl.create( ActionType.getByName( LiteralHelper.actionTypeSet.getNameByDisplayName( cmbActionType.getText( ) ) ),
				value );
		return TriggerImpl.create( TriggerCondition.getByName( LiteralHelper.triggerConditionSet.getNameByDisplayName( lastTriggerType == null
				? cmbTriggerType.getText( ) : lastTriggerType ) ),
				action );
	}
	public void clear( )
	{
		cmbTriggerType.select( 0 );
		cmbActionType.select( 0 );
		switchUI( );
	}
	private void switchUI( )
	{
		switch ( getTriggerIndex( ) )
		{
			case INDEX_1_URL_REDIRECT :
				this.slValues.topControl = cmpURL;
				break;
			case INDEX_2_TOOLTIP :
				this.slValues.topControl = cmpTooltip;
				break;