如何在GWT CellTable中向ButtonCells添加工具提示？

public class TooltipButtonCell extends ButtonCell {
    @Override
    public void render(Context context, SafeHtml data, SafeHtmlBuilder sb) {
        ButtonElement button = Document.get().createPushButtonElement();
        button.setTitle("Tooltip Text"); // 设置工具提示文本
        if (data != null) {
            sb.appendHtmlConstant(button.toString());
        }
    }
}

Column<YourDataObject, String> buttonColumn = new Column<YourDataObject, String>(new TooltipButtonCell()) {
    @Override
    public String getValue(YourDataObject object) {
        return "Button Text";
    }
};
cellTable.addColumn(buttonColumn, "Button Column");

.tooltip::after {
    content: attr(title);
    /* 其他样式设置 */
}

cellTable.addColumnStyleName(columnIndex, "tooltip");