fix for download button after download dialog
fix for download button after download dialog

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