No way to react to validation error messages in dropPane?

[IanVS]

I have a drop pane set to only accept image files. If a different kind of file is dragged onto it, I see a red error like File test.csv is not an accepted file type. The accepted file types are image/*. I see this error on all drop panes on the page. Here's how it looks in the jsfiddle:

I have two questions:

1. Can the error be limited to just one of the drop panes?
2. How can I either a) intercept this message and handle it myself or b) at least get a callback when the message disappears?

The onError doesn't seem to be called.

[pcholuj]

Hi
Yup its look like error message is a bug. We have to separate it for each drop panel.