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.
UI/org.eclipse.birt.report.designer.ui.editors.schematic/src/org/eclipse/birt/report/designer/internal/ui/editors/script/JSEditor.java
Label lblScript = new Label( parent, SWT.NONE );
		lblScript.setText( Messages.getString( "JSEditor.Label.Script" ) ); 
		final FontData fd = lblScript.getFont( ).getFontData( )[0];
		Font labelFont = new Font( Display.getCurrent( ),
				fd.getName( ),
				fd.getHeight( ),
				SWT.BOLD );
		lblScript.setFont( labelFont );
		GridData layoutData = new GridData( SWT.BEGINNING );
		lblScript.setLayoutData( layoutData );
	}
	private void initComboBoxes( Composite parent )
	{
		
		cmbExpList = new Combo( parent, SWT.READ_ONLY );
		GridData layoutData = new GridData( GridData.BEGINNING );
		layoutData.widthHint = 140;
		cmbExpList.setLayoutData( layoutData );
		
		cmbSubFunctions = new Combo( parent, SWT.DROP_DOWN | SWT.READ_ONLY );
		cmbSubFunctions.setLayoutData( layoutData );
	}
	/*
	 * SelectionChanged. - Selection listener implementation for changes in
	 * other views Selection of elements in other views, triggers this event. -
	 * The code editor view is updated to show the methods corresponding to the
	 * selected element.
	 */
	public void handleSelectionChanged( SelectionChangedEvent event )
	{