.setBg(colour)
Calls .config(background=colour)
Then loops through .winfo_children()
And if not __widgetIsContainer() calls __setWidgetBg()
.set XXX Bg(colour)
If METER calls setBg
If TABBEDFRAME calls setBg
Else calls __setWidgetBg()
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.__widgetIsContainer() - checks the isContainer field
.__setWidgetBg() - the big one!
Checks widget type, then calls appropriate setters
tabbedFrame rethink: BGs: * Container - only visible at end of tab bar * Tabs - active/inactive * Panes - each one
Therefore: * Make tabs/Panes match colour! * have active/inactive writing colour * container BG
activeforeground activebackground
bg fg
disabledforeground disabledbackground