<DescriptionAttribute()>
<CategoryAttribute("Behavior")>
Public Event AddItem As RowEventHandler

Dim instance As WebCombo
Dim handler As RowEventHandler
 
AddHandler instance.AddItem, handler

[DescriptionAttribute()]
[CategoryAttribute("Behavior")]
public event RowEventHandler AddItem

public event AddItem: RowEventHandler; 

In JScript, you can handle the events defined by another class, but you cannot define your own.

[DescriptionAttribute()]
[CategoryAttribute("Behavior")]
public: __event RowEventHandler* AddItem

[DescriptionAttribute()]
[CategoryAttribute("Behavior")]
public:
event RowEventHandler^ AddItem

private void WebCombo1_InitializeDataSource(object sender, ISNet.WebUI.WebCombo.DataSourceEventArgs e)
{
    oleDbDataAdapter1.Fill( dsNorthWind1 );
    e.DataSource = dsNorthWind1;
}

protected void OnAddItem(object sender, RowEventArgs e) 
{
    DataSet ds = (DataSet)WebCombo1.GetCachedDataSource();

    DataRow row = ds.Tables[0].NewRow();
    row["CustomerID"] = e.Row.Value;
    row["ContactName"] = e.Row.Value;  

    ds.Tables[0].Rows.Add(row);

    // performs update to physical datasource.
}