Hi Bo,
Just pasting this on the forum in case somebody else needs this feature:
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Currently the step line does not support VH (vertical-horizontal) connection (only HV), but there are also several other modes (depending on the front of the line – ascending or descending).
The good news is that we have this setting in the underlying charting engine and it will be published by the end of this week in the VS2010 compatible edition of the controls. I expect we’ll have a SSRS update several days after the VS2010 compatible launch.
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Best regards,
Bob