Crystal Reports.Net: SeriesAxisDivision Properties...

I need to display a line chart within a report that;
retrieves data from an SQL server and displays it over a period of time specified by the user.
this works, but as the data is recorded every minute, when the user selects a time span
of more than one hour the labels on the x-axis become illegible!

I have asked many different people how to solve this, the people at crystaldecisions website
say that I can set a property that define the amount of labels to display by missing out a set
number, this doesn't work!

There are two properties that appear in the properties window
when you click on the chart;
SeriesAxisDivisionMethod and
SeriesAxisDivisionNumber
I get the impression that you can set the method to manual and the number to 10, just like
the DataAxisDivisionMethod and DataAxisDivisionNumber, but it will not change!

is it possible to change these?
if so can I change them from within vb.net?

please help.

thanks in advance
Tom