Or you can even do it the other way round setting C<multiple> to 1 on creation
and open a single selection popup with js.
+If C<%params> contains C<multiple_pos_input> an input field with the dom id
+C<multi_items_position> will be rendered in the alternative popup.
+This can be used in the callback for C<set_multi_items> to controll the
+input postion for the items.
+
+If C<%params> contains C<multiple_limit> the alternative popup will not
+show any results if there are more than C<multiple_limit> results. A warning
+message is displayed in this case. Set C<multiple_limit> to 0 to disable
+the limitation. The limit defaults to 100.
+
Obsolete parts will by default not be displayed for selection. However they are
accepted as default values and can persist during updates. As with other
selectors though, they are not selectable once overridden.