If you want to display multiple subsets of an attribute on a single page then you need to duplicate the attribute in order for the chart to work correctly. An example of this is the HEAP_USED_POST_GC attribute in the GarbageCollectionsPage. It should be possible to use a single attribute and filter it into different subsets rather than creating a new attribute for each subset. This would make enhancements such as visualizing the tenuring distribution in a single graph easier to implement.