Update README.md

README.md

@@ -17,14 +17,17 @@
 # A simple example
 
 ```julia
-w = Toplevel("Example")                                  ## A titled top level window
-f = Frame(w, padding = [3,3,2,2], relief="groove")       ## A Frame with some options set
-pack(f, expand = true, fill = "both")                    ## using pack to manage the layout of f
+using Tk
 
-b = Button(f, "Click for a message")                     ## Button constructor has convenience interface
-grid(b, 1, 1)                                            ## use grid to pack in b. 1,1 specifies location
+w = Toplevel("Example")                                 ## A titled top level window
+f = Frame(w, padding = [3,3,2,2], relief="groove")      ## A Frame with some options set
+pack(f, expand = true, fill = "both")                   ## using pack to manage the layout of f
 
-callback(path) = Messagebox(w, title="A message", message="Hello World") ## A callback to open a message
+b = Button(f, "Click for a message")                    ## Button constructor has convenience interface
+grid(b, 1, 1)                                           ## use grid to pack in b. 1,1 specifies location
+
+## A callback to open a message
+callback(path) = Messagebox(w, title="A message", message="Hello World") 
 bind(b, "command", callback)                            ## bind callback to 'command' option
 bind(b, "<Return>", callback)                           ## press return key when button has focus
 ```