python - Why does ttk.Button appears in the main window instead of tk.Toplevel? -

i have main ui gets instantiated this:

class myapp(ttk.frame):     def __init__(self, master):         ttk.frame.__init__(self, master)         (...)      def make_gui(self):         (...)         self.helpbutt = ttk.button(self.innerrightfrm2, padding=(0, 0),                                    text='help', image=help_icon                                    compound='left', command=self.show_help)         (...)  def main():     root = tk.tk()     root.title('myapp')     root.columnconfigure(0, weight=1)     root.rowconfigure(0, weight=1)     root.resizable(true, true)     root.update()     gui = myapp(root)     gui.mainloop() 

when user clicks show help button located on main interface new toplevel window should appear. toplevel of window contains 2 frames: topframe0 on row=0 , topframe1 on row=1. create third frame inside topframe1 put "close" button in in. here how it:

def show_help():     top_win = tk.toplevel()     top_win.title('help')     top_win.resizable(0, 0)      topframe0 = ttk.frame(top_win, borderwidth=2, relief='groove')     topframe0.grid(row=0, column=0, sticky='nsew')     topframe1 = ttk.frame(top_win, borderwidth=2, relief='flat')     topframe1.grid(row=1, column=0, sticky='nsew')     buttonframe = ttk.frame(topframe1, borderwidth=2, relief='groove').grid()     ttk.button(buttonframe, padding=(0, 2), text='close', command=top_win.destroy).grid(sticky='e') 

however, instead of appearing in right botton of toplevel window (notice red arrow in screenshot), "close" button appears in right bottom of main myapp window! how can happen?

in line

buttonframe = ttk.frame(...).grid() 

you assign none buttonframe because grid() returns none have later ttk.button(none, ...) , add button main window.

you need

buttonframe = ttk.frame(...) buttonframe.grid()