Example

using System.Windows.Documents;
using System.Windows.Input;
using Intersoft.Client.Framework.Input;

namespace ClientUIApplication_Docs.Commands
{
    public static class EditingCommands
    {
        private static readonly HybridRoutedCommand BoldCommand =
            new HybridRoutedCommand("Bold", "Bold", typeof(EditingCommands));

        private static readonly HybridRoutedCommand ItalicCommand =
            new HybridRoutedCommand("Italic", "Italic", typeof(EditingCommands));

        public static HybridRoutedCommand Italic
        {
            get { return ItalicCommand; }
        }

        public static HybridRoutedCommand Bold
        {
            get { return BoldCommand; }
        }

        public static void Initialize()
        {
            // empty static class initializer
        }
    }
}

using System.Windows;
using System.Windows.Documents;
using ClientUIApplication_Docs.Commands;
using Intersoft.Client.Framework.Input;
using Intersoft.Client.UI.Navigation;

namespace ClientUIApplication_Docs.RoutedCommands
{
    public partial class EditorHybridCommand : UXPage
    {
        public EditorHybridCommand()
        {
            EditingCommands.Initialize();
            InitializeComponent();
            textBox1.SelectionChanged += new RoutedEventHandler(textBox1_SelectionChanged);
        }

        private void BoldCmdCanQueryStatus(object sender, CanQueryStatusRoutedEventArgs e)
        {
            e.CanQueryStatus = true;
        }

        private void BoldCmdQueryStatus(object sender, QueryStatusRoutedEventArgs e)
        {
            if (e.Command == EditingCommands.Bold)
            {
                // notifies the current bold status to the command source
                // that bound to the Bold command.

                e.QueryParameter.Value = (FontWeight)textBox1.Selection.
                    GetPropertyValue(Run.FontWeightProperty) == FontWeights.Bold;
            }
        }

        private void BoldCmdCanExecute(object sender, CanExecuteRoutedEventArgs e)
        {
            e.CanExecute = true;
        }

        private void BoldCmdExecuted(object sender, ExecutedRoutedEventArgs e)
        {
            // apply bold formatting if the current selection is not bold yet.

            if ((FontWeight)textBox1.Selection.GetPropertyValue(Run.FontWeightProperty) == FontWeights.Bold)
                textBox1.Selection.ApplyPropertyValue(Run.FontWeightProperty, FontWeights.Normal);
            else
                textBox1.Selection.ApplyPropertyValue(Run.FontWeightProperty, FontWeights.Bold);
        }

        private void textBox1_SelectionChanged(object sender, RoutedEventArgs e)
        {
            CommandManager.InvalidateRequerySuggested();
        }
    }
}