datagrid that wouldn't want to sort

[Zeng]

Hello,

I've been creating several datagrids now and I ran into one of them that
wouldn't sort even though I believe I have done the usual things to make the
the columns sortable. Have anyone run into this issue before? There must
be something tricky that I missed.

Here is the html portion of the column header that I expect to sort, it
looks the same as the datagrid that does actually sort.

href="javascript:__doPostBack('m_listDg','sort:Subject ASC')">Subject

Thank you very much in advance

 

[Zeng]

Never mind about my earlier post.