const colorInspector = MSColorInspector.alloc()
this.popover = BCPopover.alloc().init();
popover.showRelativeToView_preferredEdge(view, NSMinYEdge); // where `view` is an NSView
I haven't gone much further than getting it to show up (this was a PoC from a few weeks ago), but judging by the headers it looks like creating a delegate class that implements
MSColorInspectorDelegate and assigning it to the inspector will give you change notifications, among other things.