Figure 3. The leaf assimilation module, a typical wimovac model dialog. i) Multiple choice selector. ii). Input box for user entry of values used to drive the model. iii) Dynamically changing labels in response to user changes to the multiple choice selectors. iv). On/off tick box. v) C3/C4 submodel selector button. vi) Selecting the Start button begins the simulation. vii) Selecting the Stop button finishes the simulation and attempts to plot the results so far calculated. viii) The close button terminates the model dialog and closes its child window within the parent window.