Thank you for writing.
Images used for minimize and close buttons are incorrect and I confirm that this is an issue. I have logged it in our feedback portal
. You can track its progress, subscribe for status changes and add your vote/comment on the following link - feedback item
. I have also updated your Telerik points
I have modified TelerikMetro
themes and attached them to this post.
I hope this helps. Should you have any other questions, do not hesitate to contact us.