Hi Stefan,
Please refer to the
test sample attached here. Both the DomainUpDownExts - on the CommandBar and on the Form, have Sunken Border3DStyle and they look similar. Let me know if you can see the above mentioned issue in this sample. If possible, kindly modify this sample and send it back to us so that we could further investigate this issue here. Also, let me know the version of Essential Tools that you are using. We appreciate your cooperation.
Regards,
Guru Patwal
Syncfusion, Inc.