Custom Theme That Overrides Default Theme WP7

Question

Is it possible to create a custom theme and have it used as the default theme?

Every example I can find anywhere says you can create custom themes by copying the

Answer 1

It is not possible in the current version of WP7 to have a new Style that changes the default one without explicitly set it via "x:Key":

Implicit Styles are a feature of Silverlight 4 (and WPF): Windows Phone 7 is based on Silverlight 3+(with a few Silverlight 4 features added). Since there’s no Implicit Styles in Silverlight 3 this mean that there is no way to use them in Windows Phone 7 as well.

For now you can:

1. Only override the default Brushes/Colors resources as explained in the first article that you pointed out. Note that all WP7 controls will change their colors. Note also that for some reason the default Background remains unchanged. This is a known issue with the current version of WP7 and probably will be fixed in the "Mango" update.

2. If you want to have any new Style/ControlTemplate you must use the "x:Key"/{StaticResource ...} approach as mentioned in the second article that you pointed out.

Finally, as Derek Lakin mentioned previously: hopefully this bug will get fixed in the Mango update!