Drag and Drop?

Flow
1

Hi,everyone.
I need to use drag and Drop function like :https://jqueryui.com/draggable/

But nothing work(.
Pls help

@JavaScript("js/jquery.js")//loaded
@JavaScript("js/jquery-ui.js")//loaded
public class MainView extends VerticalLayout {
..................
  //Show window
  MyCustomWindow window = new MyCustomWindow();
  window.setId("myWindow");
  UI.getCurrent().add(window)
  
  
   Page page = UI.getCurrent().getPage();

        String st = "$( function() {\n" +
                "    $( \"#myWindow\" ).draggable();\n;\n" +
                "  } );";
        page.executeJavaScript(st);
		
..................		
  
}

MyCuctomWindow:

public class MyCustomWindow  extends Composite<Div> {
   	.....................
}