You can change this by clicking on the upside down triangle in the upper right corner of the Dimensions box (next to the magnifying glass) and select Sort By-->Data Source Order.
Hope this helps!
thanks for getting back to me.
i tryed what you said, but 'data source order' is greyed out and so i cant tick it.
would this have anything today with my data being 'fully imported'.
i didnt see any options on sorting when i imported though.