Thank you for writing.
I have just tested the color dialog on Windows 7 x64 (English version), with the latest version of our compoenets and the dialog is shown correctly - with all three text sizes - Smaller 100%, Medium 125% and Larger 150%.
Can you please confirm the precise configuration where the issue appears and also share some screen shots of the incorrect layout.
Thank you in advance for your time and cooperation.
All the best,
the Telerik team