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I just stumbled upon Mage_Adminhtml_Block_Newsletter_Subscriber_Grid_Renderer_Checkbox and am not able to tell where exactly this renderer is actually used. Can anybody tell me? Or is it some relict that is still there but not used anymore (I am using 1.7.0.2)? Just curious.

In my opinion it would make sense to use it as a renderer in Mage_Adminhtml_Block_Newsletter_Subscriber_Grid::_prepareColumns but there is no reference. Am I missing something?

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Not sure about this but I think it's a copy/paste issue.
There is this other renderer for the newsletter problems grid. Mage_Adminhtml_Block_Newsletter_Problem_Grid_Renderer_Checkbox. that one is actually used in Mage_Adminhtml_Block_Newsletter_Problem_Grid.

 $this->addColumn('checkbox', array(
         'sortable'     => false,
        'filter'    => 'adminhtml/newsletter_problem_grid_filter_checkbox',
        'renderer'  => 'adminhtml/newsletter_problem_grid_renderer_checkbox',
        'width'     => '20px'
    ));

The one you are asking about is not used and it has never been used (at least from 1.1.1 'till now).
I think someone just created it because it cloned the problems grid.

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