Access violation in delphi-7 - delphi

Question

OK i'm writing an educational program that uses different forms. This is the first time i'm coding with multiple form as i'm still a novice programmer.
when my "sign in" button is clicked it opens the new form but then displays an access violation code.
unit SignInNew_u;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls, ExtCtrls, xpman;
type
TSignInNew = class(TForm)
Panel1: TPanel;
Label2: TLabel;
Label3: TLabel;
Label1: TLabel;
Label4: TLabel;
edtName: TEdit;
edtSurname: TEdit;
btnSignIn: TButton;
help: TButton;
procedure btnSignInClick(Sender: TObject);
procedure helpClick(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
var
SignInNew: TSignInNew;
implementation
uses HelpNew_u, ElementsNew;
{$R *.dfm}
procedure TSignInNew.btnSignInClick(Sender: TObject);
var
sName,sSurname,text:string;
User:TextFile;
begin
ElementsNew.TMain.Create(self);
ElementsNew.Main.Show;
Main.WindowState:= wsMaximized;
end;
procedure TSignInNew.helpClick(Sender: TObject);
begin
HelpNew := THelpNew.Create(self);
HelpNew.Show;
HelpNew.Width:=281;
HelpNew.Height:=481;
end;
end.
This is how it looks
any help would be appreciated.

Answer 1

Looking your code, you are instantiating a class (TMain)
ElementsNew.TMain.Create(self);
but never assigning it to a variable. You are using a nil var (Main)
ElementsNew.Main.Show;
Main.WindowState:= wsMaximized;
To solve this:
Main := ElementsNew.TMain.Create(self);
Main.Show;