Steps to reproduce:
1. Add two check boxes to a form
2. Set the Checked property of one to true
3. Set their enable property to false
4. Set the theme to TelerikMetroBlue 

Run the project and you will see that both check boxes look the same - disabled and unchecked.

The same applies to Office2010Blue and RadRadioButton

Workaround it by enabling the checkboxes for a moment and then disabling them.