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
{
			return INDEX_5_HIGHLIGHT;
		}
		if ( cmbActionType.getText( )
				.equals( LiteralHelper.actionTypeSet.getDisplayNameByName( ActionType.TOGGLE_VISIBILITY_LITERAL.getName( ) ) ) )
		{
			return INDEX_3_TOOGLE_VISABILITY;
		}
		if ( cmbActionType.getText( )
				.equals( LiteralHelper.actionTypeSet.getDisplayNameByName( ActionType.TOGGLE_DATA_POINT_VISIBILITY_LITERAL.getName( ) ) ) )
		{
			return INDEX_7_TOOGLE_DATAPOINT;
		}
		if ( cmbActionType.getText( )
				.equals( LiteralHelper.actionTypeSet.getDisplayNameByName( ActionType.CALL_BACK_LITERAL.getName( ) ) ) )
		{
			return INDEX_6_CALLBACK;
		}
		return 0;
	}
	private Label addDescriptionLabel( Composite parent, int horizontalSpan,
			String description )
	{
		Label label = new Label( parent, SWT.WRAP );
		{
			GridData gd = new GridData( );
			gd.widthHint = 200;
			gd.horizontalSpan = horizontalSpan;
			label.setLayoutData( gd );
			label.setText( description );