shellcontrols were under construction in D6, by steve trefethen from the delphi team, and have alot of errors...i know what to change to make your thing work but i dont know how it inflicts other parts of the code, but anyway, here i go:

open te file ShellCtrls wich contains the code (in Demos), add it to your library path and source path to compile. find the following procedure :

procedure TCustomShellTreeView.SetPathFromID(ID: PItemIDList);
var
  I: Integer;
  Pidls: TList;
  Temp, Node: TTreeNode;
begin
  if FUpdating or (csLoading in ComponentState)
    or ((SelectedFolder <> nil) and SamePIDL(SelectedFolder.AbsoluteID, ID)) then Exit;
  FUpdating := True;
  Items.BeginUpdate;
  try
    Pidls := CreatePIDLList(ID);
    try
      Node := Items[0];
      for I := 0 to Pidls.Count-1 do
      begin
        Temp := FolderExists(Pidls[I], Node);
        if Temp <> nil then
        begin
          Node := Temp;
          Node.Expand(False);
        end;
      end;
      Node := FolderExists(ID, Node);
      Selected := Node;
      if Assigned(Node) then
      begin
        if Assigned(FListView) then
          FListView.TreeUpdate(TShellFolder(Node.Data).AbsoluteID);
        if Assigned(FComboBox) then
          FComboBox.TreeUpdate(TShellFolder(Node.Data).AbsoluteID);
      end;
    finally
      DestroyPIDLList(Pidls);
    end;
  finally
    Items.EndUpdate;
    FUpdating := False;
  end;
end;

whenever you set the ShellView.Path property this procedure is called but the first line contains an error and causes to Exit without an update, so you could comment it out.

to change path with the new code use this:

ShellView1.Path := Edit1.Text