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59- Use headers with a meaningful caption for each column. 59​- Use headers with a meaningful caption for each column.
60- Avoid using empty trees. 60​- Avoid using empty trees.
61- If the tree has alternative access methods such as a word search or 61​- If the tree has alternative access methods such as a word search or
62 an index, optimize the tree for browsing by focusing on the most 62​ an index, optimize the tree for browsing by focusing on the most
63 useful content. 63​ useful content.
64 64​
65 Multi selection: 65​ Multi selection:
66 66​
67- Use check boxes to indicate multiple selections. 67​- Use checkboxes to indicate multiple selections.
68- For check boxes, use the mixed state to indicate that an option is 68​- For checkboxes, use the mixed state to indicate that an option is
69 set for some, but not all, child objects. Users should not be able to 69​ set for some, but not all, child objects. Users should not be able to
70 set a mixed state directly (cf. :doc:`check boxes <checkbox>`). 70​ set a mixed state directly (cf. :doc:`checkboxes <checkbox>`).
71- Clicking a mixed state check box selects all child objects and the 71​- Clicking a mixed state checkbox selects all child objects and the
72 parent check box. 72​ parent checkbox.
73- Don’t use check boxes in single selection trees. 73​- Don’t use checkboxes in single selection trees.
74 74​
75Appearance 75​Appearance
76~~~~~~~~~~ 76​~~~~~~~~~~
77 77​
78- If high-level containers have similar contents, but have different 78​- If high-level containers have similar contents, but have different
79 purposes, consider using visual clues, e.g. icons to differentiate 79​ purposes, consider using visual clues, e.g. icons to differentiate
80 between them. 80​ between them.
81- Use persistent tree view states so that users find the list the same 81​- Use persistent tree view states so that users find the list the same
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