I'm loading bootstrap into a module:

'modules'=>array(
    'admin'=>array(
        'preload'=>array('bootstrap'),
        'components'=>array(
            'bootstrap'=>array(
                'class'=>'ext.bootstrap.components.Bootstrap',
                'responsiveCss' => true,
            ),
        )
    ),
),

in a GridView I'm trying to create a TbButtonColumn:

array(
    'class'=>'bootstrap.widgets.TbButtonColumn',
    'htmlOptions'=>array('style'=>'width: 50px'),
),

This returns a CException

Property "CWebApplication.bootstrap" is not defined.

as it points to a bootstrap in the main config app which obviously doesn't exist, how do I reference bootstrap when it is loaded in the module?

I tried:

components.bootstrap.widgets.TbButtonColumn

admin.components.bootstrap.widgets.TbButtonColumn

admin.bootstrap.widgets.TbButtonColumn