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In CJuiButton documentation, the url property is described as string. However, since the actual link is created with CHtml::link, it can also be an array of the type CHtml::link expects, i.e. with a controller action, and the additional parameters.
IMO this should be explained better as writing just "public mixed $url" would not give much more information to developers..
public mixed $url
a URL or an action route that can be used to create a URL. See normalizeUrl for more details about how to specify this parameter.
(taken form CHtml::link)
(Fixes issue #653) better description for CJuiButton->url
The description is updated but will be visible on the site only when the new Yii version is released as it's then that the documentation is regenerated.