How can I explode a nested block in a drawing with the api?

Hi,

I´m trying  modify  a large lot of drawings with the SolidWorks API.

In some of them i have nested blocks than I need to explode for modifyng his content:

I`m not able to  find the nested block with the API.

when the block is simple an has only one level  I can explode it easily with " .SketchManager.ExplodeSketchBlockInstance "

Any ideas?

SolidworksApi/macros