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
{
					desHdl.setStringProperty( cmbItemLastSelected.getName( ),
							getEditorText( ) );
				}
				selectionMap.put( getModel( ), cmbExprListViewer.getSelection( ) );
			}
			catch ( SemanticException e )
			{
				ExceptionHandler.handle( e );
				return false;
			}
		}
		return true;
	}
	/**
	 * Saves input code to model
	 * 
	 */
	public void saveModel( )
	{
		if ( isCodeModified( ) && editObject instanceof DesignElementHandle )
		{
			saveEditorContentsDE( (DesignElementHandle) editObject );
		}
		setIsModified( false );
	}
	/**
	 * @param b
	 */
	public void setIsModified( boolean b )