Today I tried to find out why the constructor of my class wasn't called. After 2 hours I found out, that it was named "__constructor" and not "__construct"... I feel so dumb right now. FML

Look at this gem (foud this the other day):

public final __construct() {
...
}

As you may see, "function" is missing here, but it was not as hard for debug like your case because your code were still valid with wrongly named constructor :)

Had the same problem with DependencyProperties... apparently when they are changed, they don't invoke property setter methods.... Still don't know how they work but they just do... like magic...