Fix popup in sandbox mode (#1980)
Fix popup in sandbox mode (#1980)


Microsoft/pxt,switchinnovations/pxt,switch-education/pxt,playi/pxt,playi/pxt,Microsoft/pxt,Microsoft/pxt,playi/pxt,switchinnovations/pxt,switchinnovations/pxt,Microsoft/pxt,Microsoft/pxt,switch-education/pxt,playi/pxt,switch-education/pxt,switch-education/pxt,switchinnovations/pxt,switch-education/pxt