Multiple user controls share collection dependency property

Question

I have implemented my own usercontrol based on listboxes. It has a dependency property with type of a collection. It works fine when I have only one instance of the usercontrol

Answer 1

Found the answer, the constructor needs to initialize the property instead of letting the static property do itself:

public SimpleList()
{
   SetValue(NumbersProperty, new List<int>()); 

   InitializeComponent();
}

Collection-Type Dependency Properties