The observed behavior is expected, as the auto complete functionality has its own popup with its own ListElement in it, so you have to set the Font of the latter as well. Here is the modified snippet:
Font f =
sender, GridViewCellEventArgs e)
var editor = e.ActiveEditor;
RadDropDownListEditor dropDown = (RadDropDownListEditor)editor;
RadDropDownListEditorElement element = (RadDropDownListEditorElement)dropDown.EditorElement;
element.Font = f;
element.ListElement.Font = f;
element.AutoCompleteSuggest.DropDownList.ListElement.Font = f;
I hope that the provided information addresses your question.
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