<div className={"ant-select ant-select-single ant-select-show-arrow"+(size==="small"?" ant-select-sm":"")} onClick={this.handleOpen.bind(this, $event)}>
    <div className="ant-select-selector">
        <span className="ant-select-selection-item">{state.label}</span>
    </div>
    <span className="ant-select-arrow">
        <es-icon type="DownOutlined"></es-icon>
    </span>
    <span hidden>{children}</span>
</div>