Attach to existing node

[joho1968]

Maybe I'm missing something (hopefully), but it'd be nice to be able to initialize a Tingle modal by passing an existing node/ID/whatever to it. Much like jQuery UI Dialog has with this construct:

$( ".selector" ).dialog({
  modal: true
});

This is useful if you want to do something more "persistent" with the dialog/modal while it's being displayed, like allow file browsing/file selection/etc.