Some problems with js in IE

With ASP.NET and Devexpress Combobox开发者_开发百科 control on page generates js. This js perfect works in Firefox, Chrome, Safari. But it don't work in IE8. There is an interesting issue with this situation:

When in IE8 and developer toolbar is on, than it's works fine. But if I close dev toolbar, then occurs error 800a025e.

UPD: I did not write js. It generates automatically. I simple write

ComboBox.Focus();

That's all.

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The problem might appear because you are using a version of DevExpress controls which are not compatible with IE 8. Can you check how your code works with the latest (11.1.7) version? Also, from your code, I suspect that the ComboBox is the value of the ASPxComboBox's ClientInstanceName property. Right?