Visual Studio graphics analyzer: how to select instance and vertex?

I'm having trouble selecting which instance (of a draw call) and which vertex I would like to debug as I'm stepping trough a vertex shader in the visual studio graphics analyzer (2015).

I am able to select by pixel which particular draw call I want to step trough a shader for, but it seems that I always get the first instance of the draw call in question.

Two questions:

(1) How can I select which instance of the draw call I'd like to debug?
(2) Also, when I'm stepping trough a vertex shader: how do I choose the vertex?
 
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