Feature Request: Clear All event

[Edgaras91]

I would like to replace Clear All with a fingerprint button, prompting the user to use a fingerprint if one is available. If not, remove the button completely.

This could be done by simply exposing an event when a "clear all" button is pressed, and not forcing to actually clear all.
Also hiding the button.

ImageSource for this button is already available which is great, however, I would like to use SVG format using another library...

Hopefully, some of the above mentioned could be implemented.