[求助]IStyleGallery.Items里面的Category是什么东西

<P><STRONG>Property</STRONG> <B>Items</B><B>(</B><BR>    <B>ByVal</B> <I>ClassName</I> <B>As</B> <a><FONT color=#910b0f>String</FONT></A>, _<BR>    <B>ByVal</B> <I>styleSet</I> <B>As</B> <a><FONT color=#910b0f>String</FONT></A>, _<BR>    <B>ByVal</B> <I>Category</I> <B>As</B> <a><FONT color=#910b0f>String</FONT></A> _<BR><B>)</B> <B>As</B> <a href="http://edndoc.esri.com/arcobjects/9.2/ComponentHelp/esriDisplay/IEnumStyleGalleryItem.htm" target="_blank" ><FONT color=#910b0f>IEnumStyleGalleryItem</FONT></A></P>
<P>前面两个知道了，最后一个是什么<BR></P>

<P>Property Items(<BR>    ByVal ClassName As String, _<BR>    ByVal styleSet As String, _<BR>    ByVal Category As String _<BR>) As IEnumStyleGalleryItem<BR>前面两个知道了，最后一个是什么</P>