In MonoDevelop we have unified custom tooltips (Xwt driven, with native UI), mainly because the regular tooltips are a bit slow, too small and not accessible. It'd be great if we could get the following:
a way to feed an optional description for properties, ideally with Markup support
Proppy should be using NSPopover (without animation) on Mac – instead of the regular tooltip by default – for the supplied descriptions
a way for the host to override the tooltip handling, like some simple iface with a callback with content and coordinates, if implemented by the host, Proppy wouldn't show it's tooltip (2.) but tell the host to do it then.
The user sometimes needs more information or context related to the property which is Editing, in VS4Mac we solve this using a popup
Proppy should implement something like this or offer to the user evenhandlers to do custom implentations on mouse over/in/out