ASP.NET MVC5 Razor, List as Master Page and Edit in the same layout

Section;
I'm Using @RenderBody() for the List View, and The following link code line

@Html.ActionLink("Edit", "EditItem", new { Id=item.Id })

makes DISAPPEAR the list(master page) and makes appear the Edit View,at the same place, in the normal layout; I want BOTH on the Screen!!
Perharps I need a partial View...I've been trying for days :(

I think this issue is not simple, can someone help me?
Thanks

Yogi