Изменение курсора при зажатие кнопки мыши

Form1->Cursor = crDrag;

Form1->Cursor = crArrow;

//---------------------------------------------------------------------------
#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::MB_L_DOWN(TMessage & msg)
{
    Form1->Cursor = crCross;
}
//---------------------------------------------------------------------------
void __fastcall TForm1::MB_L_UP(TMessage & msg)
{
    Form1->Cursor = crDefault;
}
//---------------------------------------------------------------------------

//---------------------------------------------------------------------------
#ifndef Unit1H
#define Unit1H
//---------------------------------------------------------------------------
#include <Classes.hpp>
#include <Controls.hpp>
#include <StdCtrls.hpp>
#include <Forms.hpp>
//---------------------------------------------------------------------------
class TForm1 : public TForm
{
__published:    // IDE-managed Components
private:    // User declarations
public:     // User declarations
    __fastcall TForm1(TComponent* Owner);
    void __fastcall MB_L_DOWN(TMessage & msg);
    void __fastcall MB_L_UP(TMessage & msg);
protected:
    BEGIN_MESSAGE_MAP
        VCL_MESSAGE_HANDLER(WM_LBUTTONDOWN, TMessage, MB_L_DOWN)
        VCL_MESSAGE_HANDLER(WM_LBUTTONUP, TMessage, MB_L_UP)
    END_MESSAGE_MAP(TForm)
};
//---------------------------------------------------------------------------
extern PACKAGE TForm1 *Form1;
//---------------------------------------------------------------------------
#endif