WPF DependencyProperties

Question

I have just realized I\'ve been coercing binding/dependency properties and not really fundamentally understanding the concept.

Heres the dependency property:

Answer 1

Its a Window this is set in.

public partial class Window1 : Window
{
    public string Problem
    {
        get { return (string)GetValue(ProblemProperty); }
        set { SetValue(ProblemProperty, value); }
    }

    public static readonly DependencyProperty ProblemProperty =
                    DependencyProperty.Register(
                    "Problem",
                    typeof(string),
                    typeof(Window1));


    public Window1()
    {
        InitializeComponent();

        Problem = "ifowiof";
    }

    public void OnClick(object sender, EventArgs e)
    {
        Problem = "behl";
    }

    public void OnCancel(object sender, EventArgs e)
    {
       Problem = "eioeopje";
    }
}

XAML:

It works if I set the RelativeSource like you said when it loads, but if i change the Problem property in code manually (ie. via a button click) it never updates the TextBlock with the new value.