How can I open an editable, sendable e-mail screen

Question

I am trying to create an e-mail with to and from already filled in. To create the e-mail, I'm creating a graph instance of CREmailActivityMaint. Whenever I attempt to assign new objects to the CREmailActivityMaint.CurrentMessage or CREmailActivityMaint.Message objects so that I can set values, the opening page becomes uneditable and Send is hidden:

Also when I enter values, not all of them show. In this, I entered To, From, Subject, Summary, and Body, but Body and Summary show nothing. Also if I attempt to save, I get an error stating that the Summary, To, and Subject are blank:

Answer 1

    CREmailActivityMaint graph = CreateInstance<CREmailActivityMaint>();
    graph.Message.Current = graph.Message.Insert();
    graph.Message.Current.MailTo = "[e-mail]";
    graph.Message.Current.MailCc = "[e-mail]";
    graph.Message.Current.MailBcc = "[e-mail]";
    graph.Message.Current.Subject = "Subject";
    graph.Message.Current.Body = "Body";
    graph.Message.Cache.IsDirty = false;
    PXRedirectHelper.TryRedirect(graph, PXRedirectHelper.WindowMode.NewWindow);