Avoiding Tkinter OptionMenu button resizing

I've the following OptionMenu: ``` self.textoprioridad = Label(self.frameTwo, text = "Prioridad: ", justify="center") self.textoprioridad.grid(row=n, column=4) var2 = StringVar() menu2 = OptionMenu(self.frameTwo, var2, "Primera pieza", "Esta semana", "Normal", "Baja") menu2.grid(row=n, column=5, ipadx=10) var2.set("Primera pieza") self.optionmenus_prioridad.append((menu2, var2)) ``` That shows something like this: The thing is that if I choose `Normal` from the list, the button resized and it makes smaller: I would like to know if it's any way to keep the OptionMenu button with the initial size, like this: Thanks in advance.