The file you refer to (ContentViewSingleItem) is a template, not a control. This template is used for one of the two modes of the ProductsView control.
The ProductsView control works identically to ContentView control. It is in two modes - Master and Detail. Master is used for displaying a list of items, while Detail is for displaying a single item.
If you would like to change the look and feel of the public control, you should copy the respective template (ContentViewSingleItem or ContentViewItemList), rename it, change it and set the path to the new template in the Template Path property of the public control (page Edit mode, properties of the control, Advanced tab, Appearance section -> either ItemListTemplatePath or SingleItemTemplatePath). You could also alter the CSS.
Let us know if you need further assistance.
the Telerik team
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