[julia-users] tk button background color, dynamically change

[Ben Arthur]

i'm new to Tk and am having trouble dynamically setting the background 
color of a button.  all i get is:

julia> configure(myButton, background="red")

ERROR: TclError("unknown option \"-background\"")

ditto for "bg", etc.


more generally, is there a way to get a list of all available options? 
 would be useful self-documentation...

thanks.