How programatically activate data frame in ArcMap?

Question

I want to:

1. create new data frame,
2. give it a name,
3. activate it and then fill with layers, etc. in ArcMap .NET custom command.

With this code I achieve 1. and 2., but don't know how to activate it:

// mxDocument is IMxDocument
IMap newMap = mxDocument.Maps.Create();
newMap.Name = "I can name it as I want: " + Guid.NewGuid();
mxDocument.Maps.Add(newMap);
//HOW TO Activate newMap???
mxDocument.UpdateContents();

New data frame is created, added to TOC but how to make it active?

mxDocument.ActiveView.FocusMap = newMap

gives System.NotImplementedException.

EDIT: IMaps.Create() + IMaps.Add() is too primitive way to create a data frame, it won't work properly. See this link for a better description.

Answer 1

Try setting ActiveView (rather than FocusMap) to newMap:

mxDocument.ActiveView = newMap