Hello Ibrahim Muckra,
We apologize for the late reply.
The problems with the upgrade of our controls are due to a major facelift of all 6 built-in themes which we introduced with the 2010.Q1 version. It was initiated by the necessity of providing our clients with themes which have more consistent look and feel among all Silverlight controls.
First of all, let me inform you that we don't plan to redesign our old themes again in the future. We hope that our clients are more satisfied with their new look now and we realize that this was a breaking change for all of them, who had custom themes or who had their applications' design based on one of our themes. That's why we do our best to provide working solutions for all of them.
I hope that you understand that some of our controls have a complicated design, which means for example that they have backgrounds which consist of two or more gradients. That is why it is not so easy to define which background you will need to get and set in a different place in your application.
A possible solution of this problem is to set the generated XAML of the Telerik theme which you use as a Source of ResourceDictionary within a MergedDictionaries collection. After that knowing the key of the resource you need, you can set it on the element you want.
Of course there is a possible situation when we can change some name of resource, but after the facelift mentioned above it will not be a common case.
Hope this helps.
All the best,
the Telerik team
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