<% LayoutMgr.layoutchooser %>
render a dropdown containing available layouts

Sourcecode in LayoutMgr/macros.js:
1:   function layoutchooser_macro(param) {
2:      var options = [];
3:      var size = this.size();
4:      for (var i=0;i<size;i++) {
5:         var l = this.get(i);
6:         options.push({value: l.alias, display: l.title});
7:      }
8:      Html.dropDown({name: "layout"}, options, param.selected, param.firstOption);
9:      return;
10:  }