https://sourceforge.net/tracker/?func=detail&aid=3299827&group_id=152762&atid=785194

In mac , use ctrl + click will cause context menu.
add support for command key + click to select multiple item when no checkmark.

---test case
<listbox id="box" fixedLayout="true" multiple="true" >
<listhead>
<listheader label="Name" />
<listheader label="Gender" />
<listheader label="Age" />
</listhead>
<listitem>
<listcell label="Mary" />
<listcell label="FEMALE" />
<listcell label="18" />
</listitem>
<listitem>
<listcell label="John" />
<listcell label="MALE" />
<listcell label="20" />
</listitem>
<listitem>
<listcell label="Jane" />
<listcell label="FEMALE" />
<listcell label="32" />
</listitem>
<listitem>
<listcell label="Henry" />
<listcell label="MALE" />
<listcell label="29" />
</listitem>
<listitem>
<listcell label="Mark" />
<listcell label="MALE" />
<listcell label="15" />
</listitem>
<listitem>
<listcell label="Jeffery" />
<listcell label="MALE" />
<listcell label="17" />
</listitem>
<listitem>
<listcell label="Rebecca" />
<listcell label="FEMALE" />
<listcell label="21" />
</listitem>
</listbox>