STEVENSON, Md.--(BUSINESS WIRE)--The securities litigation law firm of Brower Piven, A Professional Corporation, has commenced an investigation into possible breaches of fiduciary duty and other violations of state law by the Board of Directors of National Penn Bancshares, Inc. (“National Penn” or the “Company”) (NasdaqGS: NPBC) relating to the proposed buyout of the Company by BB&T Corporation for approximately $1.8 billion. Under the terms of the transaction, National Penn shareholders ma