MessageBox Tutorial/Centralized Decision Catching

For 99.9% of your menus, you won't need to differentiate the decision catching:

  Elseif (Choosing == 1)
    If (Choice == -1) ;No choice yet
      Set Choice to GetButtonPressed
      Return
...
  Elseif (Choosing == 2)
    If (Choice == -1) ;No choice yet
      Set Choice to GetButtonPressed
      Return
...

To reduce the lines used, and to centralize the decision catching, try this instead:

  if (Choosing == 0)
...
  elseif (Choosing > 0) && (Choice == -1)
    Set Choice to GetButtonPressed
    Return
...
  elseif (Choosing == 2)
    if (Choice == 0) ;first choice, "Gold" in the example
...
  elseif (Choosing == 3)
    if (Choice == 0) ;first choice, "25" in the example