code: function(key, value, silent){
              this._configs = this._configs || {};
              var config = this._configs[key];
              
              if (!config) {
                  return false;
              }
              
              return config.setValue(value, silent);
          }
docs: Sets the value of a config.
  @method set
  @param {String} key The name of the attribute
  @param {Any} value The value to apply to the attribute
  @param {Boolean} silent Whether or not to suppress change events
  @return {Boolean} Whether or not the value was set.