Hi BK,
After you create themes for both RadForm and RadTitleBar with one and the same ThemeName, open the xml theme file for the RadTitleBar and add the following stylesheet relation to the StylesheetRelations block:
The result stylesheet relations block will be:
This will allow you to use the style that you created for RadTitleBar in the RadFormTitleBarElement of RadForm.
I hope this helps. If you have additional questions, feel free to contact me.
Best wishes,
Nikolay
the Telerik team