Solve ds9 open second instance error after closing one.

        self.canvas = FigureCanvas(self.figure)

        self.button = QtWidgets.QPushButton(None)

        self.button.setSizePolicy(QtWidgets.QSizePolicy(policy.Maximum, policy.Fixed))

        self.button.setText("Open DS9")

        self.button.setText("Open in ds9")

        self.button.clicked.connect(self.callback_ds9)

        if has_toolbar:

        elif event.dblclick and event.button == 3: # right doubleclick

            self.delete_point(point)

    def callback_ds9(self):        

        d = ds9.DS9() # Open ds9 (this assumes no ds9 instance is yet running)

        d.set(f"file '{self.path_img}'") # Load file

        d.set('zoom to fit') # Zoom to fit

    def callback_ds9(self) -> None:

        if hasattr(self, 'ds9'): 

            ds9.ds9_xpans() # if this not called, opening new after closing one fails (dont know why :D)

        self.ds9 = ds9.DS9() # Open ds9 (this assumes no ds9 instance is yet running)

        self.ds9.set(f"file '{self.path_img}'") # Load file

        self.ds9.set('zoom to fit') # Zoom to fit

        # Change the colormap and scaling

        d.set('cmap bb')

        d.set('scale log')

        # Add a label

        #d.set('regions command {text 30 20 #text="Texto Ejemplo" font="times 18 bold"}')

        self.ds9.set('cmap viridis')

        self.ds9.set('scale log')

class StaticImage(QtWidgets.QLabel):