Challenge 4 - Colour buttons

[litdev]

As AB says, its just an internal feature that can be fun to play with, but not required in most cases.  Example where it is useful.

Code:

count = -10
Turtle.Speed = 10
While ("True")
  Turtle.MoveTo(GraphicsWindow.MouseX,GraphicsWindow.MouseY)
  count = count+1
  If (count > 0) Then
    Shapes.Remove("_turtleLine"+count)
  EndIf
  Program.Delay(100)
EndWhile