Thank you for writing.
After you drop the theme on the form, you need to set the ThemeName property of the form to the desired theme. For all other controls you can use the smart tag to set the ThemeName. This is valid if you want to see the controls with the theme at both design and run time. If you want the controls to have the theme only at run time you can use the following line in the Form_Load event handler:
"Desired theme name"
and the theme will be applied to all controls.
You can find more information on how to use themes in our Online Help.
I hope this will be useful you. If you need further assistance, I would be glad to provide it.
the Telerik team