Controlling Storybord Class

Today got burned by storyboard. So a tip I have is storyboard.Begin(this,true); since Storyboard class will not throw an exception if its not able to stop. This kind of seems a lot different then most other classes in .NET and WPF. If the function is not enabled or able to be used why the hell wouldn't it throw an exception! Who knows, just another hacked together thing by Microsoft.