1 keep track of one per display:
 
  18 tk_mbUnpost needs argument to tell which display
 
  19 tk_nextMenu needs argument to tell which display
 
  20 tk_nextMenuEntry needs argument to tell which display
 
  22 which display does "selection" work on???
 
  24 fix c event focus code to keep focus in display instead of main window
 
  26 added "focus -query window" form to find out focus on a particular display