Modal:Modal with fixed button

Build 648 on expand-menu-component
1200px
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Baseline History
Build 648b47f390
Current build. There are unaccepted changes, so build 637 is still the baseline.
Build 634a2a92a2
Accepted by Justin Bennett.
Build 633b5ec33f
Auto-accepted
Build 6323e8db44
Accepted by Justin Bennett.
Commenting is disabled because there's a newer build on this branch