Create Themes for Windows Phone 7

H开发者_C百科ow can I create a theme for all controls on the interface so that you don't have to set style for each control?

In this case you will need to override the default system styles. You can find more info by reading:

Theme Forcing for Windows Phone 7 (Silverlight)

How to override theme resources in Windows Phone 7.5

Also, I recommend checking out the ThemeManager by Jeff Wilcox