VizTip: Allow KPI objects with Master Item components

 Title pretty much says it all - it'd be great if VizTips could include KPI ojbects with master items, which would dramatically increase the available options in designing a VizTip.

Some obvious use cases include:

Top N charts (not currently an option in KPI designer, I believe)

Chart types not available in KPI Designer

Tables and pivots

I appreciate that this can have a negative impact on performance, so a warning would be a good idea, but a properly-developed object should still load quickly enough to be a useful VizTip.