Direction of Chart Axis Labels

Sometimes the chart axis labels are vertical.
Sometimes the chart axis labels are horizontal.
How can I control this?
Thank you in advance.
JerryDid you see this related thread?
http://msdn.microsoft.com/newsgroups/default.aspx?dg=microsoft.public.sqlserver.reportingsvcs&mid=3f2c6661-5754-4d85-bd41-bf5fdc97a5db&sloc=en-us
In RS 2000, the orientation is determined automatically based on the
available space. Providing additional manual and automatic label modes is
under consideration for a future release.
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"Jerry Nixon" <jerrynixon@.gmail.com> wrote in message
news:36f558cf.0410120839.b124e0@.posting.google.com...
> Sometimes the chart axis labels are vertical.
> Sometimes the chart axis labels are horizontal.
> How can I control this?
> Thank you in advance.
> Jerry