How to show/hide a custom button in an editor

Update:
Starting with version 10.2.10, you can use the ButtonInfo.Visibility property to hide/show a custom button.

This sample illustrates how to show/hide a custom button in the ComboBoxEdit. Inherit from the ButtonInfo, and implement the ButtonInfoVisibility dependency property. Implement the ButtonInfo template, and bind the Button.Visibility property to the ButtonInfoVisibility property. We plan to implement this property: S35955