WPF: How do I edit the contents of a DockPanel that is located inside a UserControl?

1 I am not getting your design approach correctly here. Why do you need a Dependancy property as DockPanel. You can directly refer the DockPanel in your usercontrol code behind if you set x:Name property in the XAML and access that name say _dockPanel.

Access _dockPanel. Children property to manipuate its chidren.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.