Dark themes loading on TopLevel widgets

[miguelssimao]

I am currently using a dark theme throughout my application, and it is the same theme for all of the windows.

Every time I opened the application, I used to see a white window before all widgets loaded with the theme's colors, but I fixed this by hiding the main window with withdraw() and then showing the window after every widget was created with the deiconify() function.

But I can't seem to replicate this behavior for TopLevels. I've tried the following:

• Having a button that creates, withdraws and then deiconifies a TopLevel for settings
• Creating this TopLevel at the same time as the main window and then having the button just deiconifying it

The settings window loads without the dark theme and, only after it is displayed, the theme is applied to the widgets.

I am unsure if this is a bug regarding TopLevels or if I'm simply using the wrong approach.

Has anybody else experienced this? Thank you in advance.