Hi Amarbir,
I am afraid we are not aware of such an issue with the RadComboBox.
A possible cause for the unexpected behavior could be an eventual JavaScript error on the page. I would suggest you use the DevTools of your browser to monitor the Console for errors. Check out the Improve Your Debugging Skills with Chrome DevTools blog post as it may help you with the troubleshooting.
One more thing you can try In case you have Ajax enabled on the page, is to disable it temporarily and test the application while monitoring the Browser's Console for JavaScript errors again, see Get more descriptive errors by disabling AJAX.
I have tested the provided declaration of the ComboBox and it works as expected on my side, see http://somup.com/cYjZQY6NO3
I have used an alert method for testing:
function IsCheckAllSelected(sender, eventArgs) {
alert('OnClientBlur fired!');
}
If the suggested above is not helping in troubleshooting the issue we would need to see a reproduction of the problem in order to help. Please share the steps to replicate the problematic behavior so that we can inspect it locally. It would also be helpful if you provide us a runnable sample that will show us the problem.
Kind regards,
Doncho
Progress Telerik
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