code: function (cmd, ui, value, args) {
          return this.editorCommands.execCommand(cmd, ui, value, args);
        }
docs: Executes a command on the current instance. These commands can be TinyMCE internal commands prefixed with "mce" or
  they can be build in browser commands such as "Bold". A compleate list of browser commands is available on MSDN or Mozilla.org.
  This function will dispatch the execCommand function on each plugin, theme or the execcommand_callback option if none of these
  return true it will handle the command as a internal browser command.
  
  @method execCommand
  @param {String} cmd Command name to execute, for example mceLink or Bold.
  @param {Boolean} ui True/false state if a UI (dialog) should be presented or not.
  @param {mixed} value Optional command value, this can be anything.
  @param {Object} args Optional arguments object.