public void BeginEdit()
{
if (!IsEditing)
{
BackupState = new BackupState();
}
}
protected override void SetMember(string propertyName, object value)
{
if (IsEditing)
{
BackupState.SetOriginalValue(propertyName, GetPropertyInfo(propertyName).GetValue(ProxiedObject, null));
BackupState.SetNewValue(propertyName, value);
RaisePropertyChanged(propertyName);
}
else
{
base.SetMember(propertyName, value);
}
}