Calling a C# overloaded method with out parameters from F#

Question

I have the following F# code to handle a Gtk.TreeView event:

  tree.CursorChanged.Add(fun (e : EventArgs) -> 
      let selection = tree.Selection
      let mutable iter = new TreeIter ()
      if selection.GetSelected(&iter) then
        Console.WriteLine("Path of selected row = {0}", model.GetPath(iter))
      )

selection.GetSelected has two overloads, with signatures

bool GetSelected(out TreeIter, out ITreeModel)

and

bool GetSelected(out TreeIter)

which is preventing me from using the tuple-returning version as described in this post:

let selection = tree.Selection
match selection.GetSelected() with
| true, iter -> // success
| _ -> // failure

Is there any way to specify which GetSelected overload I want with the latter syntax?

Edit: To clarify the question, I know what method signature I want; I just don't know how to specify it. For instance, I tried this, which didn't work:

let f : (byref<TreeIter> -> bool) = selection.GetSelected
match f() with
| true, iter -> // success
| _ -> // failure

Answer 1

I think

match selection.GetSelected() : bool*_ with
...

should work.