Represents a collection of user interface (UI) elements.
The UIItem group is used as an element of the toolbar, menu, and menuArea elements.
The following example is the XML Schema declaration of the UIItem group:
<xsd:group name="UIItem">
<xsd:choice>
<xsd:element ref="xsf:button" />
<xsd:element ref="xsf:menu" />
</xsd:choice>
</xsd:group>