. Dropdown 3

. assessed problems

! Dropdown3
! draw cells
! rects, text
! pass to UI graphics (open/close)

! Dropdown selects a cell (root: selected_cell)
! Dropdown hovers a cell (root: hovered_cell)

! dropdowns in dropdowns:
dropdown cells have their own names

! DiD: Dropdown selects a cell
! DiD: Dropdown hovers a cell