Suite a ce post
http://www.developpez.net/forums/d1099056/c-cpp/outils-c-cpp/cppbuilder/combobox-listview/
et a ce lien
http://www.functionx.com/bcb/howto/cboxinstringgrid.htm
Voici le code complete pour gerer un ListBox dans une cellule d'un StringGrid
Sur la Form un StringGrid un ListBox les Items completes et Visible a false
Le code
Code : Sélectionner tout - Visualiser dans une fenêtre à part
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//---------------------------------------------------------------------------
#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::FormCreate(TObject *Sender)
{
    StringGrid1->Cells[4][0] = "Nom";
}
//---------------------------------------------------------------------------
void __fastcall TForm1::StringGrid1Click(TObject *Sender)
{
if( StringGrid1->Col == 4 )
{
String d = StringGrid1->Cells[StringGrid1->Col][StringGrid1->Row];
        for(int a = 0; a < ListBox1->Items->Count; a++)
        {
if(d == ListBox1->Items->Strings[a])
{
ListBox1->ItemIndex = a;
StringGrid1->Cells[StringGrid1->Col][StringGrid1->Row] = ListBox1->Items->Strings[a];
}
        }
        TRect Recto     = StringGrid1->CellRect(StringGrid1->Col, StringGrid1->Row);
        ListBox1->Top  = StringGrid1->Top;
        ListBox1->Left = StringGrid1->Left;
        ListBox1->Top  = ListBox1->Top + Recto.Top + StringGrid1->GridLineWidth;
        ListBox1->Left = ListBox1->Left + Recto.Left + StringGrid1->GridLineWidth + 1;
        ListBox1->Height = (Recto.Bottom - Recto.Top) + 1;
        ListBox1->Width  = Recto.Right - Recto.Left;
        ListBox1->Visible = True;
        ListBox1->BringToFront();
}
    else
    {
    ListBox1->Visible = false;
    }
}
//---------------------------------------------------------------------------
void __fastcall TForm1::ListBox1Click(TObject *Sender)
{
StringGrid1->Cells[StringGrid1->Col][StringGrid1->Row] = ListBox1->Items->Strings[ListBox1->ItemIndex];
}
//---------------------------------------------------------------------------