Basic CombBox implementation. Browser is IE 10. Using AjaxControlToolkit July 2013 edition -- also tried wthe September 2013 edition.
```
<form id="form1" runat="server">
<asp:ToolkitScriptManager ID="ScriptManager1" runat="server" CombineScripts="False" EnablePartialRendering="true"></asp:ToolkitScriptManager>
<ajaxToolkit:ComboBox ID="ComboBox1" runat="server">
<asp:ListItem Text="[Select an item]" Value="" />
<asp:ListItem Text="Actual Item #1" Value="SomeValue" />
<asp:ListItem Text="Actual Item #2" Value="3" />
<asp:ListItem Text="Actual Item #3" Value="xxx" />
</ajaxToolkit:ComboBox>
</form>
```
In Internet Explorer 10, when a key is pressed in the ComboBox, this exception is thrown.
Comments: Thank you for reporting this issue! Unfortunately, we can't reproduce this issue in the new v15.1.2 version of AJAX Control Toolkit. Try upgrading to it, and this error will be no longer reproducible.
```
<form id="form1" runat="server">
<asp:ToolkitScriptManager ID="ScriptManager1" runat="server" CombineScripts="False" EnablePartialRendering="true"></asp:ToolkitScriptManager>
<ajaxToolkit:ComboBox ID="ComboBox1" runat="server">
<asp:ListItem Text="[Select an item]" Value="" />
<asp:ListItem Text="Actual Item #1" Value="SomeValue" />
<asp:ListItem Text="Actual Item #2" Value="3" />
<asp:ListItem Text="Actual Item #3" Value="xxx" />
</ajaxToolkit:ComboBox>
</form>
```
In Internet Explorer 10, when a key is pressed in the ComboBox, this exception is thrown.
Comments: Thank you for reporting this issue! Unfortunately, we can't reproduce this issue in the new v15.1.2 version of AJAX Control Toolkit. Try upgrading to it, and this error will be no longer reproducible.