How to get the bounding box for block in drawing

Hello everyone,

     I want insert some blocks use my tool, but when i insert the first one, i can't get the block size (width and height). i want insert the next block close to the first one( No Overlap).

     so i want to get the bounding box like the part or assembly. but i can't find the API . who can help me to fine a solution?

SolidworksApi macros