I’ve just started messing around with Windows Phone development, and I’m looking for some resources that describe what is off limits.
For example, I’ve gathered that it is not possible to create a custom system theme, or even modify a theme, which was unexpected. In the MSDN, there are references to the 10 defaults, and it makes mention that operators and OEMs can add an 11th, but I haven’t found anything that says “Thou shalt not make a theme”.
Such a list would be infinite in length. Look at what you CAN do and then everything else is off limits.
The most comprehensive list of what is possible can be found at http://msdn.microsoft.com/en-us/library/ff402535(v=vs.92).aspx