public UserGroupVM SelectedUserGroup
        {
            get { return _SelectedUserGroup; }
            set
            {
                if (LastSavedUserGroupID != Guid.Empty)
                {
                    value = UsersAndGroups.FirstOrDefault(ug => ug.Id == LastSavedUserGroupID);
                }

                if (value == null )
                {
                    VisualState = "NotUserGroupSelected";
                }
                else
                {
                    if (((value is UserVM) && !(_SelectedUserGroup is UserVM)) || ((value is GroupVM) && !(_SelectedUserGroup is GroupVM)))
                    {
                        VisualState = "NotUserGroupSelected";
                    }
                    if (value is UserVM)
                    {
                        SelectedGroup = null;
                        SelectedUser = new UserContract()
                        {
                            Id = value.Id,
                            Name = value.Name,
                            DisplayName = value.DisplayName,
                            Description = value.Description,
                            SMSEnabled = ((UserVM)value).SMSEnabled,
                            SMSNumber = ((UserVM)value).SMSNumber,
                            EMail = value.EMail,
                            EMailEnabled = value.EMailEnabled,
                            IsDeleted = value.IsDeleted,
                            IsNewPassword = false,
                            NewPassword = ""
                        };

                        VisualState = "UserSelected";
                    }
                    if (value is GroupVM)
                    {
                        SelectedUser = null;
                        SelectedGroup = new GroupContract()
                        {
                            Id = value.Id,
                            Name = value.Name,
                            DisplayName = value.DisplayName,
                            Description = value.Description,
                            GroupType = ((GroupVM)value).GroupType,
                            EMail = value.EMail,
                            EMailEnabled = value.EMailEnabled,
                            IsDeleted = value.IsDeleted
                        };
                        VisualState = "GroupSelected";
                    }
                }
                _SelectedUserGroup = value;
                SetSelectedUserGroup();
                OnPropertyChanged("SelectedUserGroup");
            }
        }