code: function () { 
  				if(this.is_focused()) { return; }
  				var f = $.jstree._focused();
  				if(f) { f.unset_focus(); }
  
  				this.get_container().addClass("jstree-focused"); 
  				focused_instance = this.get_index(); 
  				this.__callback();
  			}
docs: deal with focus