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 ComboBox dans une cellule d'un StringGrid
Sur la Form un StringGrid un ComboBox 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[3][0] = "Nom";
}
//---------------------------------------------------------------------------
void __fastcall TForm1::StringGrid1Click(TObject *Sender)
{
if( StringGrid1->Col == 3 )
{
String d =  StringGrid1->Cells[StringGrid1->Col][StringGrid1->Row];
for(int a = 0; a < ComboBox1->Items->Count; a++)
{
        if(d == ComboBox1->Items->Strings[a])
        {
        ComboBox1->ItemIndex = a;
        StringGrid1->Cells[StringGrid1->Col][StringGrid1->Row] = ComboBox1->Items->Strings[a];
        }
}
TRect Recto     = StringGrid1->CellRect(StringGrid1->Col, StringGrid1->Row);
ComboBox1->Top  = StringGrid1->Top;
ComboBox1->Left = StringGrid1->Left;
ComboBox1->Top  = ComboBox1->Top + Recto.Top + StringGrid1->GridLineWidth;
ComboBox1->Left = ComboBox1->Left + Recto.Left + StringGrid1->GridLineWidth + 1;
ComboBox1->Height = (Recto.Bottom - Recto.Top) + 1;
ComboBox1->Width  = Recto.Right - Recto.Left;
ComboBox1->Visible = True;
}
    else
    {
    ComboBox1->Visible = False;
    }
}
//---------------------------------------------------------------------------
void __fastcall TForm1::ComboBox1Click(TObject *Sender)
{
    StringGrid1->Cells[StringGrid1->Col][StringGrid1->Row] =
     ComboBox1->Items->Strings[ComboBox1->ItemIndex];
}
//---------------------------------------------------------------------------