[Tkinter] Can´t create a class for frames

[ThomasFab]

Finally I found a solution:

   class CustomFrames(tk.Frame):
        def __init__(self,parent):
            super().__init__(parent)
            #self.parent.add(self.frame, text="Start   ")
            notebook1.add(self, text="Start   ")  # add a tab to the notebook


    frame01Start=CustomFrames(notebook1)