Don't know about the lnx package. And I didn't check your code.
But I can answer beginner's questions:

1.  The plus sign means concatenation for strings.
    var s = "text"
    s += "\n"
2. fmt.Println prints to standard output, but fmt.Sprintln prints to a 
string.
3. Similar answer: Use fmt.Sscanf.

Ahh ... and you might like the word 'button' better than 'bottom' :-)

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