The CellButtonClick event is fired after the user has released the left mouse button over a cell of button type.  Use the CellHasButton property to specify whether a cell is of button type. The CellButtonClick event notifies your application that user presses a cell of button type. Use the CellCaption property to determine the caption of the cell being clicked.

The following VB sample sets the cells of the first column to be of button type, and displays a message when one of them has been clicked.

Private Sub ComboBox1_InsertItem(ByVal Item As EXCOMBOBOXLibCtl.HITEM)
    ComboBox1.Items.CellHasButton(Item, 0) = True
End Sub

Private Sub ComboBox1_CellButtonClick(ByVal Cell As EXCOMBOBOXLibCtl.HCELL)
    MsgBox "The user clicks the cell's button. " & ComboBox1.Items.CellCaption(, Cell)
End Sub

The following C++ sample displays a message when the user clicks a button in the cell:

void OnCellButtonClickCombobox1(long Cell) 
{
	COleVariant vtMissing; V_VT( &vtMissing ) = VT_ERROR;
	CString strCaption = V2S( &m_combobox.GetItems().GetCellCaption( vtMissing, COleVariant( (long)Cell ) ) );
	MessageBox( "The cell of button type has been clicked." + strCaption );
}

where the V2S function converts a VARIANT expression to a string expression, 

static CString V2S( VARIANT* pv, LPCTSTR szDefault = _T("") )
{
	if ( pv )
	{
		if ( pv->vt == VT_ERROR )
			return szDefault;

		COleVariant vt;
		vt.ChangeType( VT_BSTR, pv );
		return V_BSTR( &vt );
	}
	return szDefault;
}

The following VB.NET sample displays a message when the user clicks a button in the cell:

Private Sub AxComboBox1_CellButtonClick(ByVal sender As Object, ByVal e As AxEXCOMBOBOXLib._IComboBoxEvents_CellButtonClickEvent) Handles AxComboBox1.CellButtonClick
    MsgBox("The cell of button type has been clicked." & AxComboBox1.Items.CellCaption(, e.cell))
End Sub

The following C# sample displays a message when the user clicks a button in the cell:

private void axComboBox1_CellButtonClick(object sender, AxEXCOMBOBOXLib._IComboBoxEvents_CellButtonClickEvent e)
{
	MessageBox.Show("The cell of button type has been clicked. " + axComboBox1.Items.get_CellCaption(null, e.cell).ToString() );
}

The following VFP sample displays a message when the user clicks a button in the cell:

*** ActiveX Control Event ***
LPARAMETERS item, colindex

wait window "The cell of button type has been clicked."

private void CellButtonClick(object sender,exontrol.EXCOMBOBOXLib.HCELL Cell)
{
}

Private Sub CellButtonClick(ByVal sender As System.Object,ByVal Cell As exontrol.EXCOMBOBOXLib.HCELL) Handles CellButtonClick
End Sub

private void CellButtonClick(object sender, AxEXCOMBOBOXLib._IComboBoxEvents_CellButtonClickEvent e)
{
}

void OnCellButtonClick(long Cell)
{
}

void __fastcall CellButtonClick(TObject *Sender,Excomboboxlib_tlb::HCELL Cell)
{
}

procedure CellButtonClick(ASender: TObject; Cell : HCELL);
begin
end;

procedure CellButtonClick(sender: System.Object; e: AxEXCOMBOBOXLib._IComboBoxEvents_CellButtonClickEvent);
begin
end;

begin event CellButtonClick(long Cell)
end event CellButtonClick

Private Sub CellButtonClick(ByVal sender As System.Object, ByVal e As AxEXCOMBOBOXLib._IComboBoxEvents_CellButtonClickEvent) Handles CellButtonClick
End Sub

Private Sub CellButtonClick(ByVal Cell As EXCOMBOBOXLibCtl.HCELL)
End Sub

Private Sub CellButtonClick(ByVal Cell As Long)
End Sub

LPARAMETERS Cell

PROCEDURE OnCellButtonClick(oComboBox,Cell)
RETURN

<SCRIPT EVENT="CellButtonClick(Cell)" LANGUAGE="JScript">
</SCRIPT>

<SCRIPT LANGUAGE="VBScript">
Function CellButtonClick(Cell)
End Function
</SCRIPT>

Procedure OnComCellButtonClick HCELL llCell
	Forward Send OnComCellButtonClick llCell
End_Procedure

METHOD OCX_CellButtonClick(Cell) CLASS MainDialog
RETURN NIL

void onEvent_CellButtonClick(int _Cell)
{
}

function CellButtonClick as v (Cell as OLE::Exontrol.ComboBox.1::HCELL)
end function

function nativeObject_CellButtonClick(Cell)
return