Xamarin forms datagrid does not show related data

Question

I am trying to setup the following. A listview that shows a list of daily surgery cases. When a case is clicked it navigates to a content page containing the details for the case as well as a linked datagrid that contains all of the staff (caseStaffJoin) for the case. I am able to see the listview and navigate to the case detail. The problem is that the staff do not populate the datagrid using the sxCaseId. How do I get the datagrid to show the related staff.

public class SxCaseDetailViewModel :ViewModelBase
    {

        private ObservableCollection<CaseStaffJoin> _caseStaffJoins;
        private ISxCaseDataService _sxCaseDataService;
        private ICaseStaffJoinDataService _caseStaffJoinDataService;
        private SxCase _selectedSxCase;
        private CaseStaffJoin _selectedCaseStaffJoin;


        public SxCaseDetailViewModel(IConnectionService connectionService,
            INavigationService navigationService, IDialogService dialogService,
            ICaseStaffJoinDataService caseStaffJoinDataService,
            ISxCaseDataService sxCaseDataService)
             : base(connectionService, navigationService, dialogService)
        {
            _sxCaseDataService = sxCaseDataService;
            _caseStaffJoinDataService = caseStaffJoinDataService;

            CaseStaffJoins= new ObservableCollection<CaseStaffJoin>();
        }

        public ObservableCollection<CaseStaffJoin> CaseStaffJoins
        {
            get => _caseStaffJoins;
            set
            {
                _caseStaffJoins = value;
                OnPropertyChanged();
            }
        }


        public SxCase SelectedSxCase
        {
            get => _selectedSxCase;
            set
            {
                _selectedSxCase = value;
                OnPropertyChanged();
            }
        }

        public CaseStaffJoin SelectedCaseStaffJoin
        {
            get => _selectedCaseStaffJoin;
            set
            {
                _selectedCaseStaffJoin = value;
                OnPropertyChanged();
            }
        }

        private async Task GetCaseStaffJoins()
        {
            CaseStaffJoins = (ObservableCollection<CaseStaffJoin>)await _caseStaffJoinDataService.GetAllCaseStaffJoinsAsync();
        }

        public override async Task InitializeAsync(object data)
        {
            IsBusy = true;

            SelectedSxCase = (SxCase)data;


            IsBusy = false;
        }

    }

}

Page

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:utility="clr-namespace:QiX.Utility;assembly=QiX"
             xmlns:renderers="clr-namespace:Syncfusion.SfDataGrid.XForms.Renderers;assembly=Syncfusion.SfDataGrid.XForms"
             xmlns:xForms="clr-namespace:Syncfusion.SfDataGrid.XForms;assembly=Syncfusion.SfDataGrid.XForms"
             x:Class="QiX.Views.SxCaseDetailView"
             utility:ViewModelLocator.AutoWireViewModel="True"
             Title="Details">
    <ContentPage.Content>
        <ScrollView>
            <StackLayout>
                <StackLayout Padding="10">
                    <Grid Grid.Row="0" Padding="10" x:Name="MasterGrid">

                        <Grid.RowDefinitions>

                            <RowDefinition Height="*"/>
                            <RowDefinition Height="*"/>
                            <RowDefinition Height="*" />
                            <RowDefinition Height="*" />
                            <RowDefinition Height="*" />
                            <RowDefinition Height="*" />
                            <RowDefinition Height="*" />
                            <RowDefinition Height="*" />
                            <RowDefinition Height="*" />
                            <RowDefinition Height="*" />

                        </Grid.RowDefinitions>

                        <Grid.ColumnDefinitions>

                            <ColumnDefinition Width="100"/>

                            <ColumnDefinition Width="*"/>

                        </Grid.ColumnDefinitions>

                        <Label Text="CaseId" Grid.Row="0" Grid.Column="0"/>
                        <Label Text="{Binding SelectedSxCase.SxCaseId}" Grid.Row="0" Grid.Column="1"/>
                        <Label Text="Dos" Grid.Row="1" Grid.Column="0"/>
                        <renderers:SfDatePicker x:Name="dos" BindingContext="{Binding SelectedSxCase.Dos}" Grid.Row="1" Grid.Column="1" HorizontalOptions="StartAndExpand"/>
                        <Label Text="Eye" Grid.Column="0" Grid.Row="2"/>
                        <Picker x:Name="EyePicker" ItemsSource="{Binding Eyes, Mode=TwoWay}" 
                                ItemDisplayBinding="{Binding Eye1, Mode=TwoWay}"
                                SelectedItem="{Binding SelectedSxCase.EyeId, Mode=TwoWay}"
                                SelectedIndex="{Binding SelectedSxCase.EyeId, Mode=TwoWay}" Grid.Column="1" Grid.Row="2"/>
                        <Label Text="Facesheet" Grid.Column="0" Grid.Row="3"/>
                        <Entry Text="{Binding SelectedSxCase.Facesheet, Mode=TwoWay}" Grid.Column="1" Grid.Row="3"/>
                        <Label Text="Record" Grid.Column="0" Grid.Row="4"/>
                        <Entry Text="{Binding SelectedSxCase.Record, Mode=TwoWay}" Grid.Column="1" Grid.Row="4"/>
                        <Label Text="Complication" Grid.Column="0" Grid.Row="5"/>
                        <Switch IsToggled="{Binding SelectedSxCase.Complication, Mode=TwoWay}" Grid.Column="1" Grid.Row="5"/>
                        <Label Text="ReturnOr" Grid.Column="0" Grid.Row="6"/>
                        <Switch IsToggled="{Binding SelectedSxCase.ReturnOr, Mode=TwoWay}" Grid.Column="1" Grid.Row="6"/>
                        <Label Text="Physician" Grid.Column="0" Grid.Row="7"/>
                        <Picker x:Name="PhysicianPicker" ItemsSource="{Binding Physicians, Mode=TwoWay}" 
                                ItemDisplayBinding="{Binding Physician1, Mode=TwoWay}"
                                SelectedItem="{Binding SelectedSxCase.PhysicianId, Mode=TwoWay}"
                                SelectedIndex="{Binding SelectedSxCase.PhysicianId, Mode=TwoWay}" Grid.Column="1" Grid.Row="7"/>

                        <Button Text="Update Case" Style="{StaticResource RegularButton}"
                                    Command="{Binding UpdateSxCaseCommand}" Grid.Row="8" Grid.Column="0" Grid.ColumnSpan="2" 
                                    HorizontalOptions="Center"/>
                        <Button Text="Delete Case" Style="{StaticResource RegularButton}" 
                                    Command="{Binding DeleteSxCaseCommand}" Grid.Row="8" Grid.Column="1" Grid.ColumnSpan="2" 
                                    HorizontalOptions="Center"/>


                    </Grid>

                </StackLayout>
                <StackLayout>
                    <xForms:SfDataGrid 
            ItemsSource="{Binding CaseStaffJoins}"
            DefaultColumnWidth="100">
                    </xForms:SfDataGrid>
                </StackLayout>

            </StackLayout>

        </ScrollView>

    </ContentPage.Content>
</ContentPage>