title: Bind event to individual characters tcl/tk
body: <p>I'm trying to display binary information in a widget (ie. text, entry, label). The individual characters, in this case only '0' or '1' should be clickable so that they toggle between 0 and 1. </p>
  
  <p>I'm not quite sure which widget to use and how to bind a mouse event to a individual character. </p>
  
  <p>I hope someone can point me into the right direction, since I'm fairly new to the TK side of things. </p>