Full milking barrels

[Sevenless]

Could we get the equivalent of the "stockpile full" click when we click on a milkable animal with a full milk barrel overhead/full bucket? For mixed herds it's annoying to keep putting the barrel down to check if it's full or if that animal hasn't given birth yet.

[pppp]

Or have a slightly different look of the barrel when it is full. Similar to e.g cupboards now, will be useful in more situations.
+1 anyway because having extra reminder won't hurt.