How to add simple custom-control to map

[Liuk88]

Hello guys, I'm trying to find a simple way to add a custom-control to my map.
I saw many examples in the page: http://tombatossals.github.io/angular-leaflet-directive/examples/0000-viewer.html#/controls/
but i dont't understand how to add it into the map.
In particular, I would like to add for example a white square with some checkboxes defined by me (but I don't know how to tell this to the angular.extend({.....})) because the few examples in the page I linked are all layers or plugins
Do you have some examples/suggestions?
Thanks to all :)