Hi Tino,

Thank you for sharing your feedback. We reviewed those changes and decided to approve the feature request. However, because there are two separate features described in this request I've moved the clear all selection button information into a separate feature request. You can find it here: https://feedback.telerik.com/wpf/1365472-multicolumncombobox-add-clear-all-selection-button

You can also find your Telerik points updated.

Regards,
Martin Ivanov
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