SDK 6.1 debugging - step into

Hello,

This might be a stupid question ...
But how do you debug (step into) a Plug-In project? I just downloaded the SDK and  I was running a template project, it does the right stuff - opens VS with the ReSharper plug-in, but even if I set a breakpoint in the Execute method of the IActionHandler interface, it won't step into the method. Does anyone have any pointers on this?

Thanks and Happy New Year!