Fixes missing unit scope

Fixes missing unit scope

Author: chuacw

Demos/Minimal/Main.pas

@@ -6,8 +6,9 @@
 interface
 
 uses
-  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
-  VirtualTrees, StdCtrls, ExtCtrls;
+  Winapi.Windows, Winapi.Messages, System.SysUtils, System.Classes, Vcl.Graphics,
+  Vcl.Controls, Vcl.Forms, Vcl.Dialogs, VirtualTrees, Vcl.StdCtrls, Vcl.ExtCtrls,
+  VirtualTrees.BaseAncestorVCL, VirtualTrees.BaseTree, VirtualTrees.AncestorVCL;
 
 type
   TMainForm = class(TForm)