GUI specific initializings and restoring registry settings belongs to ReadWindowOptions. So, move all two lines from FormCreate here.

source/childwin.dfm

@@ -14,7 +14,6 @@ object MDIChild: TMDIChild
   Visible = True
   OnActivate = FormActivate
   OnClose = FormClose
-  OnCreate = FormCreate
   OnDeactivate = FormDeactivate
   OnShow = FormShow
   PixelsPerInch = 96

source/childwin.pas

@@ -505,7 +505,6 @@ type
         DropPosition: TPoint);
     procedure ComboBoxQueryDelimiterExit(Sender: TObject);
     procedure ComboBoxQueryDelimiterAdd(delimiter: String);
-    procedure FormCreate(Sender: TObject);
     procedure menuLogToFileClick(Sender: TObject);
     procedure menuOpenLogFolderClick(Sender: TObject);
     procedure vstGetHint(Sender: TBaseVirtualTree; Node: PVirtualNode;
@@ -931,6 +930,10 @@ var
   reg         : TRegistry;
 
 begin
+  // Initialize delimiter settings
+  delimiter := DEFAULT_DELIMITER;
+  ComboBoxQueryDelimiter.ItemIndex := ComboBoxQueryDelimiter.Items.IndexOf( delimiter );
+
   reg := TRegistry.Create;
   if reg.OpenKey( REGPATH, true ) then
   begin
@@ -6325,14 +6328,6 @@ begin
 end;
 
 
-procedure TMDIChild.FormCreate(Sender: TObject);
-begin
-  // See reference: mysql.cpp Ver 14.12 Distrib 5.0.45, for Win32 (ia32): Line 365
-  delimiter := DEFAULT_DELIMITER;
-  ComboBoxQueryDelimiter.ItemIndex := ComboBoxQueryDelimiter.Items.IndexOf( delimiter );
-end;
-
-
 {***
   Callback procedure able to handle client-side SQL statements such as DELIMITER