We have had a bug related to the ComboBox' SelectedIndexChanged event triggering for ComboBox controls on the page which the user hasn't changed the selected item in, but it has been fixed and this behavior is not reproducible in the latest version of our controls.
Please, find attached a sample page, which contains four ComboBox controls. Could you configure them as they are in your project so that the issue you are experiencing is reproduced in the sample page and post your modifications for further review? We would like to see the ComboBoxes' configuration and test them with different controls versions, in order to confirm whether this is an old and already fixed bug or it is unknown and is present in the current version as well.
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