Hi Serial Killer,
I inspected your web page in IE and FireFox and it seems that in IE the selected Index of RadComboBox1 remains 0, i.e. the first Item remains selected.
This is strange as the correct new Index is submitted to the server - the index of the selected Item. So there must be something else going on on the server that is causing this.
Can you please inspect your code or better, debug it to see whether the SelectedIndex property of RadComboBox1 changes and where?
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