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 :)