Hello Todd Miller,
Thank you for the questions.
I am afraid that currently you can not load the ControlDefault theme because it has not yet been reworked according to the new theming mechanism. Old themes are not editable in the new VSB and you can only extract repository items which will help you in recreating the theme. For more information, please refer to our online documentation.
Fortunately, you do not need to do this because we will provide three of the old themes which will be editable in the new VSB. These are ControlDefault, Desert and Breeze. They will be available for the service pack which will be available in the first half of April.
Setting the null text color to a different color via themes is currently not possible out of the box, because there has to be a RadProperty which indicates whether the text is null or empty. This property will be available in the upcoming service pack. You will be able to set a null text color when the combo box is in a null text state.
Also, since there will be a null text state, you will be able to set the border to any color you would like.
Please write again if you have other questions.
All the best,
the Telerik team
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