RAD combobox OnSelectedIndexChanged not firing

I am uising RadControls for ASP.NET AJAX Q1 2010 NET35

For some reason the OnSelectedIndexChanged event is not firing.

Does anybody have any ideas about what is going wrong?

Thanks,
//aspx 
<telerik:RadComboBox ID="IpnCombo" runat="server" AllowCustomText="true"  Width="500px" TabIndex="6" EnableLoadOnDemand="true"  AutoPostBack="true"  EmptyMessage="Choose from Drop-down or enter part number here."  OnItemsRequested="PopulateIpnList"  OnTextChanged="IpnCombo_TextChanged" OnSelectedIndexChanged="IpnCombo_SelectedIndexChanged" >
                    </telerik:RadComboBox>

//c# code
 protected void IpnCombo_SelectedIndexChanged(object o, Telerik.Web.UI.RadComboBoxSelectedIndexChangedEventArgs e)
    {
        PopulateUom();
    }

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anixon93Asked:
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rajeeshmcaCommented:
HI anixon93,

Is there any validations used (Required field validator etc)...  
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13598Commented:
Have you tried using:
//c# code
 protected void IpnCombo_SelectedIndexChanged(object o, Telerik.Web.UI.RadComboBoxSelectedIndexChangedEventArgs e)  Handles IpnCombo.SelectedIndexChanged
    {
        PopulateUom();
    }
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anixon93Author Commented:
I found the issue and it was that it was posting back and getting stuck with validation controls on the page.  I added:  CausesValidation="false" and now it is firing.
Thanks!
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anixon93Author Commented:
This question was leading in the direction of the solution
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