This is just a guess from my Tk experience, but some widgets use -bg instead of -background.

Some widgets yes, but not ttk::button

A "tk::button" aka a button does take both -bg and -background

ttk widgets, themed tk widgets, manipulate that stuff through -style , kinda like css

see http://www.tcl.tk/man/tcl/TkCmd/ttk_intro.htm, http://www.tkdocs.com/tutorial/styles.html

In reply to Re^2: Limitations with Tkx configure options? by Anonymous Monk
in thread Limitations with Tkx configure options? by murrayn

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