Hi Hubert,

Thank you for contacting us.

The internal state of the Window will update when an event of the Window is fired and since the position is change manually outside of the Window events, the internal state will not update. However, you can manually update the state by using the Window ref and its setState method:

• https://stackblitz.com/edit/react-hyhjxg-9se4hn?file=app%2Fapp.tsx

  const windowRef = React.useRef(null);

  const moveToCorner = () => {
    setPosition({ ...position, top: 70, left: 30 });
    windowRef.current.setState({ top: 70, left: 30 });
  };

  return (
    <div>
      <Button onClick={handleShowWindow}>Show/Hide</Button>
      <Button onClick={moveToCorner}>move to corner</Button>
      {opened && (
        <Window
          ref={windowRef}

Nevertheless, we will consider handling this internally when the position values are changed externally. 

Regards,
Konstantin Dikov
Progress Telerik