Pass value from navigator - frustrated

I have a $$Navigatortemplatedefault with a Field “ViewTitle” (Frameset with 3 Frames LeftNav, TopNav, MainNav). When a User opens a view this field is set by formula:

FIELD ViewTitle := ViewTitle;

@SetTargetFrame(“MainNav”);

@SetField(“ViewTitle”; “($All)”);

@Command([OpenView];“($All)”)

Now I want create a new document by Navigator and pass the last view value with Url:

FIELD ViewTitel := ViewTitle;

tmp:=@GetField(“ViewTitle”);

@SetTargetFrame(“MainNav”);

@URLOpen(“http://myServer/myDatabase.nsf/myForm?OpenForm&LastView=” + tmp)

but no value reaches my form. I am a “Web-Newby” and tried many different solutions, but without success, because Forum only offers many fragments of help…