Multiselect Options Text

To render the text-values of an multiselect in a BE-grid:


Image Grid Column Renderer

To show product image previews in Magento Backend, you have to add a image grid column renderer block first:

Afterwards you can add images in a Backend grid block class (f.e.: descendant of Mage_Adminhtml_Block_Catalog_Product_Grid) like that (in _prepareColumns):