Bug fix: Tab order on extension options dialog was broken, if the extension mixed options in and out of group box.

Source commit: 396d7a27cb639f6e10857da673d56df2e63f18d5

source/forms/Custom.cpp

@@ -346,6 +346,8 @@ void __fastcall TCustomDialog::StartGroup(const UnicodeString & Caption)
 
   AdjustHeight(GroupBox);
 
+  AddWinControl(GroupBox);
+
   FPos = ScaleByTextHeight(this, 16);
   FPrePos = FPos;
   FIndent = FHorizontalMargin;