FIX Ensure field GridField has a 100% relative width rather than fixed
FIX Ensure field GridField has a 100% relative width rather than fixed

dnadesign/silverstripe-userforms,robbyahn/silverstripe-userforms,dnadesign/silverstripe-userforms,silverstripe/silverstripe-userforms,robbyahn/silverstripe-userforms,silverstripe/silverstripe-userforms