title: Prism CRM techniques
body: <p>We're planning to develop a lightweight CRM (customers, orders, resources etc) application in WPF with Prism.v4. We already built a outlookbar-like usercontrol and use the microsoft ribbons. There exist additional regions, but these are the essential ones for this scenario.</p>
  
  <p>Furthermore there exists an infrastructure dll with all the models, repositories, interfaces etc etc.</p>
  
  <p>After some brainstorming we came up with the following fact:</p>
  
  <p>The customermodule needs nothing to know about the ordersmodule (the ordersmodule knows the customer models). But we want the usercomfort to load all orders which belong to a specific customer. So in customer-detail-mode (customer ribbontab and customer outlookbar items are injected) we want a ribbonbutton to navigate from "customer detail" to "this customers orders".</p>
  
  <p>The question is: how to achieve this without breaking the loose coupling?</p>
  
  <p>Our approach: giving the customer-ribbontab a region for other modules interaction with customers. Because the ordermodule defenitively knows about the customer (based on the 1:n relation from our datamodel).</p>
  
  <p>Thank you in advance</p>