Trusting the Document

So far we have been talking only about trusting the customization assembly. That makes sense—it is, after all, the container of the code that is going to run. However, there is something quite unusual about customized documents that makes them very different from traditional forms-based applications. Here is a silly but illustrative example. Suppose you write a customization for a budget spreadsheet that has two named ranges that have event handlers that handle their double-click events as shown in Figure 19-9.