#1,198 – Selectively Enabling Child Elements in a Disabled Panel

When you set IsEnabled to false in a panel, all child elements in that panel are disabled. You cannot selectively enabled child elements in the panel.

You may, however, want to selectively enable child elements in a panel. (E.g. Disable entire panel, then set IsEnabled=True, IsReadOnly=True on TextBox controls so that you can copy text).

One possible solution is to define a new control that inherits from TextBox and does not coerce the value of IsEnabled.

    public class CanEnableTextBox : TextBox
    {
        static CanEnableTextBox()
        {
            CanEnableTextBox.IsEnabledProperty.OverrideMetadata(typeof(CanEnableTextBox),
                new System.Windows.UIPropertyMetadata(true,
                    new PropertyChangedCallback(IsEnabledPropertyChanged),
                    new CoerceValueCallback(CoerceIsEnabled)));

        }

        private static void IsEnabledPropertyChanged(DependencyObject source, DependencyPropertyChangedEventArgs args)
        {
            // Overriding PropertyChanged results in merged metadata, which is what we want--
            // the PropertyChanged logic in UIElement.IsEnabled will still get invoked.
        }

        private static object CoerceIsEnabled(DependencyObject source, object value)
        {
            return value;
        }
    }

You can now use this control in a panel that has IsEnabled set to false and you’ll be able to set IsEnabled on the child TextBox.

About Sean
Software developer in the Twin Cities area, passionate about .NET technologies. Equally passionate about my own personal projects related to family history and preservation of family stories and photos.

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