Mobile XMADL：如何在按钮上添加圆角边框，并在按下时更改其颜色？

我正在使用XMADL为Android和iOS编写应用程序。我在屏幕上定义了一个按钮

<control type="PUSHBUTTON" x="39" y="24" width="50" height="8" appearance_name="blue_bkgrnd" data_type="VARCHAR" default_value="Button 2"/>

此按钮使用的外观为

<appearance name="blue_bkgrnd" font_family="Sans-Serif" font_name="Helvetica" font_size="3" font_color="#FFFFFF" background_color="#3A5894" alpha="255" justify="CENTER" font_style_bold="1"/>

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如何使按钮具有圆角边框并在按下时更改其颜色？

要使边框圆角，请在外观中添加与边框相关的属性

<appearance name="blue_bkgrnd" font_family="Sans-Serif" font_name="Helvetica" font_size="3" font_color="#FFFFFF" background_color="#3A5894" alpha="255" justify="CENTER" font_style_bold="1" border_color="#FFFFFF" border_width="3" border_radius="4"/>

<appearance name="blue_bkgrnd_tr_border" font_family="Sans-Serif" font_name="Helvetica" font_size="3" font_color="#FFFFFF" background_color="#50A6C2" alpha="255" justify="CENTER" border_color="#FF0000" border_width="3" border_radius="4" padding="0"/>

<control type="PUSHBUTTON" x="39" y="24" width="50" height="8" appearance_name="blue_bkgrnd" data_type="VARCHAR" default_value="Button 2"