Multiselect reset by another multiselect

I have two multiselect controls on a page. One selects a community and the next one selects the projects within that community. When the projects control is set to select all, everything works fine when I choose a different community from the list - it basically maintains select all and by default selects all the projects in the new community. However, when I deselect a couple of projects from one community, then select a new community, the Projects control does not update to show all projects in the new community. I would like it to function like a Reset Control Value button, but automatically run whenever a new community is selected.
Anyone have any ideas how to set this functionality up?

Can you share a sample document?

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