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
GridLayout layout = new GridLayout( );
		layout.verticalSpacing = 0;
		mainPane.setLayout( layout );
		controller = createController( mainPane );
		
		Composite jsEditorContainer = new Composite( mainPane, SWT.NONE );
		GridData gdata = new GridData( GridData.FILL_HORIZONTAL | GridData.FILL_VERTICAL );
		jsEditorContainer.setLayoutData( gdata );
		jsEditorContainer.setLayout( new FillLayout( ) );
		return jsEditorContainer;
	}
	/**
	 * Creates tool bar pane.
	 * 
	 * @param parent
	 *            the parent of controller
	 * @return a tool bar pane
	 */
	protected Composite createController( Composite parent )
	{
		Composite barPane = new Composite( parent, SWT.NONE );
		GridLayout layout = new GridLayout( 8, false );
		GridData gdata = new GridData( GridData.FILL_HORIZONTAL );
		barPane.setLayout( layout );
		barPane.setLayoutData( gdata );
		initScriptLabel( barPane );
		initComboBoxes( barPane );
		
		butReset = new Button( barPane, SWT.PUSH );
		butReset.setText( Messages.getString( "JSEditor.Button.Reset" ) );