ChangeSubjectForm.xaml.cs

using System;
using System.Windows;
 
namespace Waher.Client.WPF.Dialogs.Muc
{
    public partial class ChangeSubjectForm : Window
    {
        public ChangeSubjectForm()
        {
            InitializeComponent();
        }
 
        private void CancelButton_Click(object Sender, RoutedEventArgs e)
        {
            this.DialogResult = false;
        }
 
        private void ApplyButton_Click(object Sender, RoutedEventArgs e)
        {
            this.DialogResult = true;
        }
 
        private void Subject_TextChanged(object Sender, System.Windows.Controls.TextChangedEventArgs e)
        {
            this.ApplyButton.IsEnabled = !string.IsNullOrEmpty(this.Subject.Text.Trim());
        }
    }
}