After having installed Tk, you might find many Tk examples in the program called widget. I just don't like the way very much how the code is written (seems to be a 1:1 translation from Tcl), but despite of that it helped me quite a lot figuring out about a lot of possibilities of Tk.

Best regards,
perl -e "s>>*F>e=>y)\*martinF)stronat)=>print,print v8.8.8.32.11.32"