Not all the functionalities of charts starting from a blank Interface page are available for charts on dashboard pages. One feature I have been missing is the "group by" option under y-axis for a Bar Chart that allows for categorization of the plotted data. It would be great if this could be added to charts on Interfaces! I have been impressed by some of the power and features enabled in "dashboard" interfaces (pivot tables, easily clicking on a chart to view underlying records, etc.) but then frustrated when some of the previous functionality from charts on a blank interface page isn't available (adding group by in plotting, editing underlying records, etc.).