Problema Css Combobox Ajax Control Toolkit

[pandres]

Utiliza las calses de estilos Originales del Combobox Ajax Control Toolkit
estos son los estilos orinales
.ajax__combobox_inputcontainer
{
}
.ajax__combobox_textboxcontainer
{
}
.ajax__combobox_textboxcontainer input
{
}
.ajax__combobox_buttoncontainer
{
}
.ajax__combobox_buttoncontainer button
{
background-image: url(<%=WebResource("ComboBox.arrow-down.gif")%>);
background-position: center;
background-repeat: no-repeat;
border-color: ButtonFace;
height: 15px;
width: 15px;
}
.ajax__combobox_itemlist
{
margin: 0px;
padding: 0px;
cursor: default;
list-style-type: none;
text-align: left;
border: solid 1px ButtonShadow;
background-color: Window;
color: WindowText;
}
.ajax__combobox_itemlist li
{
white-space: nowrap;
width: 100%;
padding: 0 3px 0 2px;
}