The AddColumn event is fired when a new column is inserted to the Columns collection. Use the Add method to add new columns to the control. Use the AddColumn event to associate extra data to a column. Use the Data property to assign an extra data to a column. The control fires the RemoveColumn event when a column is removed. Use the ColumnAutoResize property to specify whether the visible columns hits the control's client area.

The following VB sample sets the width for all columns:

Private Sub ComboBox1_AddColumn(ByVal Column As EXCOMBOBOXLibCtl.IColumn)
    Column.Width = 128
End Sub

The following C++ sample sets the width for all columns:

#include "Column.h"
void OnAddColumnCombobox1(LPDISPATCH Column) 
{
	CColumn column( Column );column.m_bAutoRelease = FALSE;
	column.SetWidth( 128 );
}

The following VB.NET sample changes the column's width:

Private Sub AxComboBox1_AddColumn(ByVal sender As Object, ByVal e As AxEXCOMBOBOXLib._IComboBoxEvents_AddColumnEvent) Handles AxComboBox1.AddColumn
    e.column.Width = 128
End Sub

The following C# sample changes the column's width:

private void axComboBox1_AddColumn(object sender, AxEXCOMBOBOXLib._IComboBoxEvents_AddColumnEvent e)
{
	e.column.Width = 128;
}

The following VFP sample changes the column's width:

*** ActiveX Control Event ***
LPARAMETERS column

with column
	.Width = 128
endwith