How to make a sectionHeader with pull?

[ceeyang]

<PullList style={styles.list} dataSource={this.state.dataSource} renderRow={this._renderRow} renderSectionHeader={this._renderSectionHeader} onPullRelease={this._onRefresh} /> When I use the 'renderSectionHeader' with PullList,It doesn't work. There is noting,The window is empty.