Knockout JS event for any viewmodel dom update

I need to run a jquery ui bit of code whenever the DOM is updated via Knockout.JS. I realize this can be done using custom bindings, but that appears to be related to a specific viewmodel, I want to do it globally so whenever it happens on any viewmodel it fires?

Lets say I ALWAYS want a JQuery datepicker on all textboxes with class 'needsdate', rather than add this to each of my view models, it would be great if I could do it globally.

Is this possible?