Controlled Components#148

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B-Reif wants to merge 5 commits intofsprojects:masterfrom

B-Reif:feature-controlled-components

Commits on Jan 23, 2021

Commits on Jan 24, 2021

update controlled checkbox example
B-Reif
committed

Commits on Jan 26, 2021

add expander and combobox
B-Reif
committed

Commits on Jan 29, 2021

implement ControlledProperty as a generalized Attr type
B-Reif
committed