allowMultiSelect
A Boolean property that controls whether multiple selections are allowed in the list box. If multiple selections are allowed, the multiSelectListname and multiSelectCodefield properties must be specified. Note that only a listbox is capable of multiple selections. If size is 1, this property will be ignored.
Default value
false() – only a single selection may be made in the list box.
Valid values
true(), false(), or a valid expression that returns True or False.