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
cmbSubFunctions.select( 0 ); 
		}
		cmbSubFunctions.setEnabled( itemCount > 0 );
		return;
	}
	private void setComboViewerInput( String message )
	{
		cmbExprListViewer.setInput( message );
		return;
	}
	/**
	 * Reset the selection forcely.
	 * 
	 * @param list
	 */
	public void handleSelectionChange( List list )
	{
		if ( scriptEditor instanceof AbstractTextEditor )
		{
			SelectionChangedEvent event = new SelectionChangedEvent( ( (AbstractTextEditor) scriptEditor ).getSelectionProvider( ),
					new StructuredSelection( list ) );
			handleSelectionChanged( event );
		}
	}
	/**
	 * Returns the current script editor.
	 * 
	 * @return the current script editor.
	 */
	protected IScriptEditor getScriptEditor( )