Thank you for contacting Telerik support and sharing your thoughts with us! I can definitely confirm that your request is a reasonable one. The biggest change in our styles was made with our Q1 2012 SP1 when we provide the option to our customers to modify the appearance of our controls using implicit styles. For that reason we gathered the style files per assembly and you may use these when creating custom themes. I strongly recommend you to check this forum thread
for further reference. From there you can see the benefits of using this approach. The same is applicable to Silverlight as well. Currently we support two kinds of theming mechanisms and you can read the difference between these approaches in the following thread.
We always appreciate customer feedback and we do our best each Q to limit the number of breaking changes for the whole control suite. As you most probably know we list all breaking changes in the
"Changes and Backwards Compatibilities" section in our online documentation. However there is no specific section for the control templates and styles, which you can use as a guideline for upgrading themes.
Each time you encounter any problems you can contact us in order to resolve the current issues you have already met.
Wish you a great day!
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