Question

I have a control called BasicUserControl2 which contains only a TextBox. I would like to register a dependency property that exposes the TextBox nested inside the control. This so that in a parent control say BasicUserControl1 I can write something like

<tt:BasicUserControl2 TextBox.FontSize="10" />

I currently have the following dependency property:

    public TextBox TextBox
    {
        get { return (TextBox)_textBox; }
        set { this.SetValue(TextBoxProperty, value); }
    }
    public static readonly DependencyProperty TextBoxProperty = DependencyProperty.Register(
      "TextBox", typeof(TextBox), typeof(BasicUserControl2));

What kind of property do I need to register? I am trying to avoid having to map properties on the textbox individually to identical properties on the parent UserControl.

Answer 1

You need to create an Attached property instead of Dependency property on your custom UserControl.