VSAT3 step by step debug in visual studio

Hi guys,

I'm using Visual Studio Pro 2015, and when I'm debugging I'm using the step by step debug (F8) :

Now I want to make a quick VSTA3 macro in SolidWorks, I got to "new macro" menu and save the macro. Visual Studio opens and I start to work.

But for some reason I cannot step by step debug, F8 doesn't work, dans the step into button in debug menu is missing :

Is that a VSTA3 limitation ? or I'm doing something wrong

Thanks

SolidworksApi/macros