anchor.diff:            <Error error={this.state.error} />
             <GroupsStudentsTable students={this.state.students}
               selected_students={this.state.selected_students}
  -            onSelectedStudentsChange={this.updateSelectedStudents}/>
  +            onSelectedStudentsChange={this.updateSelectedStudentsz}/>
             <GroupsActionsColumn refresh={this.refresh} performAction={this.performAction} />
             <GroupsTable groups={this.state.groups} 
               selected_groups={this.state.selected_groups}
  
positive.code:     componentWillMount: function() {
        this.refresh();
      },
      updateSelectedStudents: function(students) {
        this.setState({
          selected_students: students
        });
      },
      updateSelectedGroups: function(groups) {
        this.setState({
          selected_groups: groups
        });
      },
      updateSelectedStudentsInGroups: function(students) {
        this.setState({
          selected_students_in_groups: students
        });
      },
      // Sends a request to the server to perform some action
      // such as assigning or removing a member to/from a group
  
negative.code: 
    // Table of students, on the left.
    var GroupsStudentsTable = React.createClass({
      updateSelectedStudents: function(students) {
        this.props.onSelectedStudentsChange(students)
      },
      render: function() {
        var columns = [
        {
          id: 'user_name',
          content: '<%= j raw I18n.t('user.user_name') %>',
  