from tkinter.ttk import Notebook class Natural_Notebook(Notebook): def __init__(self, master, **kw): Notebook.__init__(self, master, **kw) self.bind("<<NotebookTabChanged>>", self._on_tab_changed) def _on_tab_changed(self,event): tab = event.widget.nametowidget(event.widget.select()) event.widget.configure(height=tab.winfo_reqheight()) if __name__== "__main__": from tkinter import Frame root = Tk() notebook = Natural_Notebook(root) notebook.add(Frame(notebook, width=400, height=200, name="a"),text="TAB 1") notebook.add(Frame(notebook, width=400, height=300, name="b"),text="TAB 2") notebook.add(Frame(notebook, width=400, height=100, name="c"),text="TAB 3") notebook.pack() root.mainloop()