1. Overriding Telerik.Cms.Engine.WebControls.SelectContentDialog class and its CreateChildControls where the data binding is performed through ObjectDataSource control where GetContent method is called.
2. Changing the template of SelectContentDialog where you have GridViewwith DataField="Author". This will require to override LayoutTemplatePath property.
Both the options require overriding InitializeControls of GenericContentDesigner. Here is a good KB
that explains how to do this
All the best,
the Telerik team
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