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TMS FMX UI Pack
TTMSFMXDirectoryTreeView: How to display folders first followed by files as in File Explorer

You could accomplish this by using the following code.

procedure TForm1.FormCreate(Sender: TObject); 
begin
  TMSFMXDirectoryTreeView1.Filter := '''';
  TMSFMXDirectoryTreeView1.LoadDirectory(''E:\'');
  TMSFMXDirectoryTreeView1.Sort(0, True, True, nsmDescending); 
end;

procedure TForm1.TMSFMXDirectoryTreeView1AfterExpandNode(Sender: TObject; ANode: TTMSFMXTreeViewVirtualNode);
begin
  TMSFMXDirectoryTreeView1.Sort(0, True, True, nsmDescending); 
end;

procedure TForm1.TMSFMXDirectoryTreeView1NodeCompare(Sender: TObject; Node1, Node2: TTMSFMXTreeViewNode; AColumn: Integer; var ACompareResult: Integer); var
  n1: TTMSFMXDirectoryTreeViewNode;
  n2: TTMSFMXDirectoryTreeViewNode;
begin
  n1 := TTMSFMXDirectoryTreeViewNode(Node1);
  n2 := TTMSFMXDirectoryTreeViewNode(Node2);
  ACompareResult := AnsiCompareStr(ExtractFileExt(n1.FileName), ExtractFileExt(n2.FileName));
  if ACompareResult = 0 then
    ACompareResult := AnsiCompareStr(n1.StrippedHTMLText[AColumn], n2.StrippedHTMLText[AColumn]);
    ACompareResult := ACompareResult * -1; 
end;