How to get static mesh actor from dynamically added static mesh in scene

I have a map where i can dynamically add static meshes. As soon as i select and add any mesh from the grid array, a blueprint named as “builderMesh” gets added to my world outline section. This builderMesh has (defaultsceneroot->billboard->staticmesh). But i am getting static mesh actor as NULL. How to find static mesh actor for such static mesh components?