Как обратиться к элементу формы из внешнего заголовочного файла

#include <vcl.h>
#pragma hdrstop
 
#include "Unit1.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
    : TForm(Owner)
{
};
//---------------------------------------------------------------------------
 
void __fastcall TForm1::Button1Click(TObject *Sender)
{
cat Boris;
 
Boris.PrintMes(Form1);

#ifndef Unit1H
#define Unit1H
//---------------------------------------------------------------------------
#include <Classes.hpp>
#include <Controls.hpp>
#include <StdCtrls.hpp>
#include <Forms.hpp>
#include <ClassCat.h>
//---------------------------------------------------------------------------
class TForm1 : public TForm
{
__published:    // IDE-managed Components
    TButton *Button1;
    TEdit *Edit1;
    void __fastcall Button1Click(TObject *Sender);
private:    // User declarations
public:     // User declarations
    __fastcall TForm1(TComponent* Owner);
};
//---------------------------------------------------------------------------
extern PACKAGE TForm1 *Form1;

#ifndef ClassCatH
#define ClassCatH
#include <Classes.hpp>
#include <Controls.hpp>
#include <StdCtrls.hpp>
#include <Forms.hpp>
#include <Unit1.h>
 
class TForm1; //предварительное объявление класса
 
class cat
{public:
    cat(){};
    ~cat(){};
    int GetValA()
    {return a;};
    void PrintMes(TForm1 *F1)
        {F1->Edit1->Text="dddddddd";
        };
 private:
    int a, b;
};
#endif

void PrintMes(TEdit *F1)
{
 F1->Text = "ffffffr";
}

#include <Classes.hpp>
#include <Controls.hpp>
#include <StdCtrls.hpp>
#include <Forms.hpp>
 
 
class cat
{public:
    cat(){};
    ~cat(){};
    int GetValA()
    {return a;};
    void PrintMes(TEdit *E1)
        {E1->Text="dddddddd";
        };
 private:
    int a, b;
};
#endif