problem with list border radius

[Fabio Cirillo]

As you can see in the attached image, the edges of the list of records are not border radius format. The examples in the online demo instead and there are no particular settings to make the object. How can I fix?

How can I fix? here is the html code

 

<telerik:RadSearchBox ID="RadSearchBox1" runat="server" Width="400px"
    ShowSearchButton="false"
    RenderMode="Lightweight">
    <DropDownSettings Height="300" Width="400" />
    <WebServiceSettings Path="Index.aspx" Method="GetResults"/>
</telerik:RadSearchBox>

Also how can I enter the search button in the search button?