This happens a lot when creating custom controls (mostly in code only). In many cases some properties (if not all) are dependent on each other, like for example: ItemsSource and DisplayMemberPath .. etc- I need to know the value of DisplayMemberPath while I'm iterating over the ItemsSource to render controls (set the Text of a Label to the value of DisplayMemberPath).
when I process Items in the ItemsSource collection I want to make sure that the DisplayMemberPath property has also been set,
when using the propertyChanged delegate of the ItemsSourceProperty it's likely that the DisplayMemberPathProperty is null, if it's set in XAML after ItemsSource:
<controls:FlowList ItemsSource="{Binding Items}" DisplayMemberPath="Title"/>
so, where is the proper place where I'll be sure every property has been set regardless their declaration order?