Question

This is the part where is not working. My dependency property has a default value which is Entradas.Entero, and that value must be run this line:

Grid.SetColumnSpan(button0, 3);

And it should refresh it in my user control design, however there’s no changes in it.

public partial class TableroUserControl : UserControl
{
    public enum Entradas
    {
        Entero, Decimal
    }

    public Entradas Entrada
    {
        get { return (Entradas)GetValue(EntradaProperty); }
        set { SetValue(EntradaProperty, value); }
    }

    static void textChangedCallBack(DependencyObject property, DependencyPropertyChangedEventArgs args)
    {
        Button button0 = ((TableroUserControl)property).button0;

        switch ((Entradas)args.NewValue)
        {
            case Entradas.Entero:
                Grid.SetColumnSpan(button0, 3);
                break;
            case Entradas.Decimal:
                Grid.SetColumnSpan(button0, 2);
                break;
        }
    }

    public static readonly DependencyProperty EntradaProperty =
        DependencyProperty.Register("Entrada", typeof(Entradas), typeof(TableroUserControl), new PropertyMetadata(Entradas.Entero, new PropertyChangedCallback(textChangedCallBack)));

    public TableroUserControl()
    {
        InitializeComponent();
    }
}

Answer 1

You might also consider doing this with a value converter. You should be able to bind the Grid.ColumnSpan attached property of button0 to the Entrada property of your user control. Then use a value converter to convert it to an integer. This way you don’t have to deal with callbacks and state/timing issues.