JavaFX Nie odświeża label +blokuje apke

 public void initialize(URL arg0, ResourceBundle arg1) {
		
	StartButton.setOnAction(new EventHandler<ActionEvent>() {

		@Override
		public void handle(ActionEvent event) {
        
			    Watek wk = new Watek();
				Thread thrr = new Thread(wk);
				thrr.start();
				
				while(thrr.isAlive()){
			    try {
					Watek.sleep(1000);
					Czas.setText(Integer.toString(Watek.getSekundy()));
					

				} catch (InterruptedException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
					
				}
		
		}

public void run() {

		try {
			
			for(int i=0;i<10;i++) {
				Thread.sleep(1000);
			    setSekundy(getSekundy()+1);	
			}
		} catch (InterruptedException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

	}