/**
 * @license Angular UI Tree v2.10.0
 * (c) 2010-2015. https://github.com/angular-ui-tree/angular-ui-tree
 * License: MIT
 */
(function () {
  'use strict';

  angular.module('ui.tree', [])
    .constant('treeConfig', {
      treeClass: 'angular-ui-tree',
      emptyTreeClass: 'angular-ui-tree-empty',
      hiddenClass: 'angular-ui-tree-hidden',
      nodesClass: 'angular-ui-tree-nodes',
      nodeClass: 'angular-ui-tree-node',
      handleClass: 'angular-ui-tree-handle',
      placeholderClass: 'angular-ui-tree-placeholder',
      dragClass: 'angular-ui-tree-drag',
      dragThreshold: 3,
      levelThreshold: 30
    });

})();

/**
 * @license Angular UI Tree v2.10.0
 * (c) 2010-2015. https://github.com/angular-ui-tree/angular-ui-tree
 * License: MIT
 */
(function () {
  'use strict';

  angular.module('ui.tree', [])
    .constant('treeConfig', {
      treeClass: 'angular-ui-tree',
      emptyTreeClass: 'angular-ui-tree-empty',
      hiddenClass: 'angular-ui-tree-hidden',
      nodesClass: 'angular-ui-tree-nodes',
      nodeClass: 'angular-ui-tree-node',
      handleClass: 'angular-ui-tree-handle',
      placeholderClass: 'angular-ui-tree-placeholder',
      dragClass: 'angular-ui-tree-drag',
      dragThreshold: 3,
      levelThreshold: 30,
      defaultCollapsed: false
    });

})();

Add 'defaultCollapsed' option to treeConfig