binding Control-s to a text widget

[Keagan Schopfer]

hello

I would like to bind control-s to a text widget. but, when i do this:

text.bind("<KeyPress-Control_L-a>", callback)
#or
text.bind("<Control_L-a>", callback)

it tells me TclError: extra characters after detail in binding

is there some way i can pull this off?

thanks in advance