Button: ButtonType style attribute to customize Buttons

The Button node supports a "buttonType" style attribute.

Values can be:

normal (default)
link : the button is drawn as an HTML hyperlink. In contrast to the Label Hyperlink support, clicking on a "link" button does not start the default browser, but triggers the corresponding action, like a normal Button.

Example:

<Style name="Button.link">
  <StyleAttribute name="buttonType" value="link" />
</Style>