普通按钮控件，常见于界面上的确定、应用、取消、是、否等按键。
The push button, or command button, is perhaps the most commonly used widget in any graphical user interface. Push (click) a button to command the computer to perform some action, or to answer a question. Typical buttons are OK, Apply, Cancel, Close, Yes, No and Help.
| 属性 | 数据类型 | 描述 |
|---|---|---|
| autoDefault | bool | 自动默认 |
| default | bool | 默认键（用户在对话框中按下键盘Enter键后会触发该键） |
| flat | bool | 设置外观扁平化 |
| 信号 | 说明 |
|---|---|
| showMenu | 显示(弹出)相关的弹出式菜单 |