Delaware Online – A public task force created to review the state of Delaware’s casino industry and consider a possible restructuring of gambling tax rates has decided to hold talks  with casino operators behind closed doors. The Lottery and Gaming Study Commission, created by legislation passed earlier this year, will convene an executive session next month with representatives from the state’s three casinos to discuss their proprietary financial  information. Executives from all three casinos made presentations to the commission at a public session Tuesday about the negative effects of growing regional competition and state taxation on their businesses, but only…