def __init__(self, short_description, link, css_id=None, css_class=None):
self.short_description = short_description<EOL>self.link = link<EOL>self.css_id = css_id<EOL>self.css_class = css_class<EOL>
Use it to create a ButtonableLink. It takes following parameters:
'short_description' is what you want display in this link,
'link' is the value of this link,
'css_id' is the id selector,
'css_class' is the class selector