title: Model-View-Presenter in WinForms
body: <p>I am trying to implement the MVP method for the first time, using WinForms.</p>
  
  <p>I am trying to understand the function of each layer.</p>
  
  <p>In my program I have a GUI button that when clicked upon opens a openfiledialog window.</p>
  
  <p>So using MVP, the GUI handles the button click event and then calls presenter.openfile();</p>
  
  <p>Within presenter.openfile(), should that then delegate the opening of that file to the model layer, or as there is no data or logic to process, should it simply act on the request and open the openfiledialog window?  </p>
  
  <p><strong>Update:</strong>  I have decided to offer a bounty as I feel I need further assistance on this, and preferably tailored to my specific points below, so that I have context.</p>
  
  <p>Okay, after reading up on MVP, I have decided to implement the Passive View.  Effectively I will have a bunch of controls on a Winform that will be handled by a Presenter and then the tasks delegated to the Model(s).  My specific points are below:</p>
  
  <ol>
  <li><p>When the winform loads, it has to obtain a treeview.  Am I correct in thinking that the view should therefore call a method such as: presenter.gettree(), this in turn will delegate to the model, which will obtain the data for the treeview, create it and configure it, return it to the presenter, which in turn will pass to the view which will then simply assign it to, say, a panel?</p></li>
  <li><p>Would this be the same for any data control on the Winform, as I also have a datagridview?</p></li>
  <li><p>My App, has a number of model classes with the same assembly.  It also supports a plugin architecture with plugins that need to be loaded at startup.  Would the view simply call a presenter method, which in turn would call a method that loads the plugins and display the information in the view?  Which tier would then control the plugin references.  Would the view hold references to them or the presenter?</p></li>
  <li><p>Am I correct in thinking that the view should handle every single thing about presentation, from treeview node colour, to datagrid size, etc?</p></li>
  </ol>
  
  <p>I think that they are my main concerns and if I understand how the flow should be for these I think I will be okay.</p>