anchor.diff:  - a dispatcher, handling these events and transforming the model
   - an event loop, wiring all previous types
   
  -The example is a simple winforms numeric up down. The final app will look like this: ![numericupdown](img/numericupdown.png)
  +The example is a simple winforms numeric up down. The final app will look like this:
  +
  +![numericupdown](img/numericupdown.png)
  +
   The + and - buttons increment or decrement the value, which is displayed in a label and a textbox. Changin the value in the textbox will update the value if it can be parsed to an int.
   
   ### Event type
  
positive.code:     v.Root.ShowDialog() |> ignore // v.Root is the backing visual element provided, here the MainForm instance.
      0
  
  
  (**
  Some more info
  
  
negative.code:         addAt x.ButtonDown 1 1
          addAt x.TextBox 0 0
          addAt x.Label 0 1
  
  (**
  #### Qualia View
  The actual Form backing the view. all exposed members will be used by the view.
  