Cannot change JQueryUI theme

Yii 1.1 Extensions
1

I am using the extension quickdlgs with Yii 1.1.15 to display a message.

Everything is working as long as I use the default theme.

Now I want to use a different theme in one view of my project.

After downloading the theme from https://jqueryui.com/themeroller I saved all the files in a folder "/css/overcast" in my project folder.




echo EQuickDlgs::contentButton(array(

    'dialogAttributes'=>array(

        'theme'=>'overcast',

        'themeUrl'=>Yii::app()->getBaseUrl(true).'/css',

        'options'=>array(

            'modal'=>false,

    )),

    ...

Why does this code not display the dialog using the CSS of the downloaded theme?

Please help!