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  add: function(repeat_name, count) {
    var n_blocks = GvaScript.Repeat.add(repeat_name, count);
    var last_block = repeat_name + "." + (n_blocks - 1);
    GvaScript.Form.autofocus(last_block);

    // get form owner of block
    if(_block = $(last_block)) {
      _form = _block.up('form');
      // check if form has a GvaSCript.Form instance
      // wrapped around it
      if(_form) {
        if(_gva_form = GvaScript.Forms.get(_form.identify())) {
          _gva_form.fire('RepeatBlockAdd', [repeat_name.split('.').last(), last_block]);
          _gva_form.fire('Change');
        }
      }
    }
    return n_blocks;
  },

  remove: function(repetition_block, live_update) {
    // default behavior to live update all blocks below
    // the removed block
    if(typeof live_update == 'undefined') live_update = true;

    // find element and repeat info
    var elem = $(repetition_block);
    elem.id.match(/(.*)\.(\d+)$/);
    var repeat_name = RegExp.$1;
    var remove_ix   = RegExp.$2;
    var form        = elem.up('form');
    var tree        = {}; // form deserialized as a tree
                          // only relevant if live_update

    // need to update the data for blocks below
    // as they have been reproduced
    if(live_update) {
      // get form data corresponding to the repeated section (should be an array)
      tree  = GvaScript.Form.to_tree(form);

      var parts = repeat_name.split(/\./);
      for (var i = 0, len=parts.length ; i < len; i++) {
        if (!tree) break;
        tree = tree[parts[i]];
      }

      // remove rows below, and shift rows above
      if (tree && tree instanceof Array) {
        tree.splice(remove_ix, 1);
        for (var i = 0 ; i < remove_ix; i++) {
          delete tree[i];
        }
      }
    }

    // call Repeat.remove() to remove from DOM
    // and if live_update, to remove and reproduce
    // the blocks below with correct renumerations
    GvaScript.Repeat.remove(repetition_block, live_update);

    // after form tree has been updated
    // and dom re-populated
    if(live_update) {
      // re-populate blocks below
      GvaScript.Form.fill_from_tree(form, repeat_name, tree);
    }

    // check if form has a GvaSCript.Form instance
    // wrapped around it
    if(_gva_form = GvaScript.Forms.get(form.identify())) {
      _gva_form.fire('RepeatBlockRemove', [repeat_name.split('.').last(), repeat_name + '.' + remove_ix]);
      _gva_form.fire('Change');
    }
  }
});

// copy GvaScript.Form methods into GvaScript.Form.prototype
// set the first argument of methods to this.formElt
(function() {
  var update = function (array, args) {
    var arrayLength = array.length, length = args.length;
    while (length--) array[arrayLength + length] = args[length];
    return array;
  }

  for(var m_name in GvaScript.Form.Methods) {
    var method = GvaScript.Form.Methods[m_name];
    if (Object.isFunction(method)) {
      GvaScript.Form.prototype[m_name] = (function() {
        var __method = method;
        return function() {
          var a = update([this.formElt], arguments);
          return __method.apply(null, a);
        }
      })();
    }
  }
})();