lcl: set csSubComponent flag for internally created dialogs so they will be handled by writer and reader (fixes issue #0014434)

git-svn-id: trunk@21447 -

lcl/stdactns.pas

@@ -680,6 +680,7 @@ begin
   begin
     FDialog := DlgClass.Create(Self);
     FDialog.Name := DlgClass.ClassName;
+    FDialog.SetSubComponent(True);
   end;
 end;