Javascript error selecting radcombobox item

[archimede]

I have an error retrieving the selected radcombobox item (clientside). Why doen't work? I receive error "Error: Object doesn't support this property or method"

http://www.telerik.com/help/aspnet-ajax/combo_clientsideradcombobox.html

This is my test page:

<script type="text/javascript">
        function getValue() {
            var combo = <%=RadComboBox1.ClientID %>;

            alert('1');

            var sel = combo.get_selectedItem();

        }
    </script>
    <telerik:RadComboBox ID="RadComboBox1" runat="server">
        <Items>
            <telerik:RadComboBoxItem runat="server" Text="RadComboBoxItem1" Value="RadComboBoxItem1" />
            <telerik:RadComboBoxItem runat="server" Text="RadComboBoxItem2" Value="RadComboBoxItem2" />
            <telerik:RadComboBoxItem runat="server" Text="RadComboBoxItem3" Value="RadComboBoxItem3" />
        </Items>
    </telerik:RadComboBox>
    <input id="Button1" type="button" value="button" onclick="getValue()" />

[Kalina]

Hello archimede,

Please use $find("<%= RadComboBox1.ClientID %>"); instead of  <%=RadComboBox1.ClientID %>;.

<script type="text/javascript">
    function getValue() {
        var combo = $find("<%=RadComboBox1.ClientID %>");
        alert('1');
        var sel = combo.get_selectedItem();
        alert(sel.get_text());
    }
</script>

<telerik:RadComboBox ID="RadComboBox1" runat="server">
    <Items>
        <telerik:RadComboBoxItem runat="server" Text="RadComboBoxItem1" Value="RadComboBoxItem1" />
        <telerik:RadComboBoxItem runat="server" Text="RadComboBoxItem2" Value="RadComboBoxItem2" />
        <telerik:RadComboBoxItem runat="server" Text="RadComboBoxItem3" Value="RadComboBoxItem3" />
    </Items>
</telerik:RadComboBox>
<input id="Button1" type="button" value="button" onclick="getValue()" />

All the best,
Kalina
the Telerik team