use arrow functions, fix binding issue. See #1114
use arrow functions, fix binding issue. See #1114

WXLWEB/gekko,askmike/gekko,BarnumD/gekko,generalectric/gekko,generalectric/gekko,generalectric/gekko,askmike/gekko,nourchawich/gekko,askmike/gekko,WXLWEB/gekko,BarnumD/gekko,nourchawich/gekko,BarnumD/gekko,WXLWEB/gekko,nourchawich/gekko