public void setCategory(String kateg) {
        System.out.println(kateg);
        pmk_id.setText(kateg);

    }

public void kategTreeMouseClick(MouseEvent mouseEvent) {
        int click = mouseEvent.getClickCount();

        if(click==2){
            TreeItem<pmk_category> kateg =kategTree.getSelectionModel().getSelectedItem();
            addToPMKController addCategory = new addToPMKController();
            addCategory.setCategory(kateg.getValue().getCategory());
            dialogStage.close();
        }
    }