I think you have to spell it Root.option_add("*Entry*highlightThickness", "2") Root.option_add("*Entry*highlightColor", "green")
When you're not sure of the capitalization, do something like this interactively: >>> e.configure('highlightcolor') ('highlightcolor', 'highlightColor', 'HighlightColor', 'SystemWindowFrame', 'green') When you use 'configure' this way, the *second* string has the correct capitalization for use in option_add. The fourth is the system default before taking into account the option database, and the last is the current value. Jeff
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