<% Html.Obout(new ComboBox("ComboBox1") 
    {                
        Width = 200,
        MenuWidth = 430
    }); %>
    
    

 
    @Html.Obout(new ComboBox("ComboBox1") 
    {                
        Width = 200,
        MenuWidth = 430
    })
    
    

 
    .ob_iCboICBC li
    {
        float: left;
        width: 110px;
    }
        
    /* For IE6 */
    * HTML .ob_iCboICBC li
    {
        -width: 100px;
    }