Thanks for writing and for your question.
Themes created with the old version of our Visual Style Builder are not compatible with the new theming approach and cannot be opened and edited directly in our new Visual Style Builder. The reason for this incompatibility is that the new theming approach introduces the concept of visual states
for the separate items, whereas the old theming mechanism relies on conditions based on Rad Properties
. These conditions cannot be directly parsed
to visual states
That said, you will have to recreate your old themes by using the new VSB. To simplify the process of migrating themes, we have created a tool within the Visual Style Builder
which opens an old theme, extracts all styles from it, and creates repository items which you can then assign to your controls in the new Visual Style Builder and thus recreate your theme.
Here is a good help article that gives a hint on how to extract a style repository from your old themes and use it to quickly recreate them in the new VSB:
Loading old Themes in the new Visual Style Builder
I hope this helps.
the Telerik team
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