wxPython: widget positioned incorrectly when adding one widget to a frame - widget

Question

When I use one Button in a Frame and position it using coordinates, the widget is not displayed correctly. It takes up the entire Frame. When I add another Button to the Frame, both buttons appear correctly. Why is this?
I have tried this on wxPython running on Mac OS 10.4, Mac OS 10.12, and Windows 10. Displaying one widget is done incorrectly every time.
# This will display the buttons incorrectly
import wx
app = wx.App()
frame = wx.Frame(None, wx.ID_ANY, "Main Window")
button1 = wx.Button(frame, wx.ID_ANY, "Button 1", (50, 50))
frame.Show()
app.MainLoop()
# This will display the buttons correctly
import wx
app = wx.App()
frame = wx.Frame(None, wx.ID_ANY, "Main Window")
button1 = wx.Button(frame, wx.ID_ANY, "Button 1", (50, 50))
button2 = wx.Button(frame, wx.ID_ANY, "Button 2", (160, 50))
frame.Show()
app.MainLoop()
I expect the one Button example to display in the specified place like the two button example does. Is this a bug with wxPython?

Answer 1

Think of the frame as the wrapper for your widgets. Normally a frame will contain one or more Panels.
From the documents:
if the frame has exactly one child window, not counting the status and toolbar, this child is resized to take the entire frame client area.
A panel is a window on which controls are placed.
It is usually placed within a frame. Its main feature over its parent class wx.Window is code for handling child windows and TAB traversal.
Incorporate a panel into your code:
import wx
app = wx.App()
frame = wx.Frame(None, wx.ID_ANY, "Window")
panel = wx.Panel(frame,wx.ID_ANY)
button1 = wx.Button(panel, wx.ID_ANY, "Button 1", pos=(50, 50))
frame.Show()
app.MainLoop()
and it will behave itself.