This menu contains the following options: trace,
backbone, cartoon, and ribon (and off).
1) If these options are not available, they should be
grayed out. For example, in the attached file of
dna, these options do nothing when selected.
2) Once one of these options is turned on, it can't
be turned off without turning off all the other
structure options. Also, looking at the menu, you
can't tell which options are selected. This menu
really needs checkmarks to appear and disappear when
items are selected or deselected.
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