title: How can an add-in detect when a solution is loaded?
body: <p>How can my add-in detect when a solution is loaded?  I know there must be some event somewhere in the DTE model, but I can't find it.  My add-in loads when Visual Studio loads, but it depends on a solution being open.  I don't want to make it a solution add-in until MS loses their sick fixation on COM, as solution add-ins have to be COM components.</p>