Our style manager is not designed to change the ApplicationTheme
at run-time. Hence setting it to null before the InitializeComponent()
method, all Telerik's controls will take the default theme (which is Office_Black). Basically we do not guarantee that the ApplicationTheme
will be changed as expected if you set it after the InitializeComponent()
method using the StyleManager. It is most likely that the theme will not be properly changed or changed partially.
However, if you need to switch themes at run-time you can use our Implicit Styles in combination with our NoXAML dlls. You can find more information here
Pavel R. Pavlov