When using implicit styles, we can set a custom font and font sizes globally in C# by using modifying the theme pallette (i.e. Telerik.Windows.Controls.Windows8Palette.Palette.FontSize += 6;). But since this has to be done in C# instead of in the XAML, the changes are not applied at design time for the Visual Studio Designer. This makes it difficult when building the UI as the control sizes will change based on the font and the font size that we have set.
It would be nice if we could set the font and font sizes (while using implicit styles) in XAML (or by some other means) so that the VS Designer will size the controls based on the desired font and font size. This would making life much easier when building the UI when using custom fonts.