Building Hierarchy in SSRS.

I am trying to build a hirearchy view with expanding buttons  however I cannot figure out how to pull it and display it properly because of my table design.  My table looks like this. 

Proj_id, Proj_Desc, Parent_Proj_ID.  The problem I am running into is that hierarchy is several layers deep in another words I

can have children, parents, grand parents and great grand parents in there.

I can have Proj_id =1 with Parent_Proj_ID=2  and in turn I can have another record for  Proj_ID=2 that will have Parent_proj_id=3. 

So what I am trying to do is to have format like this

Proj_ID3

    Proj_ID2

       Proj_ID1.

Thank you very much for you help.