gistfile1.js

/**
 * @class CampaignFilter
 * @extends Ext.Panel
 * Description
 */
CampaignFilter = Ext.extend(Ext.Panel, {
  
  constructor: function(config) {
    var config = config || {};

    Ext.applyIf(config, {
      //your default config goes here
    });

    CampaignFilter.superclass.constructor.call(this, config);
  },

  onRender: function(ct, position) {
    //do you resizer stuff
    
    CampaignFilter.superclass.onRender.apply(this, arguments);
  }
});