Store sortType is not working in my code.

[CODE]
<ext:JsonReader Root="Rows" TotalProperty="totalCount">
<Fields>
<ext:RecordField Name="teamid" />
<ext:RecordField Name="team" SortType="asUCText" />
<ext:RecordField Name="chain" />
<ext:RecordField Name="teamusercount" />
</Fields>
</ext:JsonReader>
[CODE]


Is there any way to sort like

abc
AB

Lowecase should come first in ASC sort Direction.

Any Idea?

Thanks in Advance.