Question

When the Complete Survey button on the Expander.Header is clicked, I would like to Navigate to another page and pass along some information from the viewmodel. I have the expander working so that when its selected it expands, and the selecteditem property is properly bound and filled. However if I just click right to the button, the selecteditem does not change and is not even populated if its the first action. How can I trigger the selected item if the button control is pressed before the expander is selected? I would prefer an MVVM solution if possible. Thanks

<ListBox  x:Name="SearchList"
                          Grid.Row="1"
                          Margin="5,0,5,0"
                          Grid.Column="0"
                          Background="Transparent"
                          BorderThickness="0"
                          BorderBrush="Transparent"
                          ItemsSource="{Binding Path=SearchResults}"
                          SelectedItem="{Binding Path=SelectedResult,Mode=TwoWay,Converter={StaticResource DebugConverter}}"
                          HorizontalContentAlignment="Stretch"
                          HorizontalAlignment="Stretch">
                    <ListBox.ItemTemplate>
                        <DataTemplate>
                            <toolkit:Expander>
                                <sb:BindingHelper.Binding>
                                    <sb:RelativeSourceBinding TargetProperty="IsExpanded"
                                                              Path="IsSelected"
                                                              RelativeMode="FindAncestor"
                                                              AncestorType="ListBoxItem" BindingMode="TwoWay" />
                                </sb:BindingHelper.Binding>
                                <toolkit:Expander.Header>
                                    <Grid Width="525">
                                        <Grid.ColumnDefinitions>
                                            <ColumnDefinition Width="*" />
                                            <ColumnDefinition Width="25" />
                                            <ColumnDefinition Width="100" />
                                        </Grid.ColumnDefinitions>
                                        <Grid.RowDefinitions>
                                            <RowDefinition Height="*" />
                                        </Grid.RowDefinitions>
                                        <TextBlock Grid.Column="0"
                                                   Grid.Row="0"
                                                   Text="{Binding Path=PatientName}" />
                                        <Button Grid.Column="2"
                                                Grid.Row="0"
                                                Content="Complete Survey">
                                            <sb:BindingHelper.Binding>
                                                <sb:RelativeSourceBinding Path="OpenSurveyCommand"
                                                                          TargetProperty="Command"
                                                                          RelativeMode="ParentDataContext" />
                                            </sb:BindingHelper.Binding>
                                        </Button>
                                    </Grid>
                                </toolkit:Expander.Header>
                                <StackPanel>
                                    <TextBlock Text="{Binding MRN,Converter={StaticResource StringLabelConverter},ConverterParameter=MRN}" />
                                    <TextBlock Text="{Binding OriginalVisitNumber,Converter={StaticResource StringLabelConverter},ConverterParameter='Original Visit Number'}" />
                                    <TextBlock Text="{Binding OriginalAdmitDate,Converter={StaticResource StringLabelConverter},ConverterParameter='Original Admit Date'}" />
                                    <TextBlock Text="{Binding OriginalReason,Converter={StaticResource StringLabelConverter},ConverterParameter='Original Reason'}" />
                                    <TextBlock Text="{Binding ReAdmitVisitNumber,Converter={StaticResource StringLabelConverter},ConverterParameter='ReAdmit Visit Number'}" />
                                    <TextBlock Text="{Binding ReAdmitDate,Converter={StaticResource StringLabelConverter},ConverterParameter='Readmit Date'}" />
                                    <TextBlock Text="{Binding ReAdmitReason,Converter={StaticResource StringLabelConverter},ConverterParameter='ReAdmit Reason'}" />
                                </StackPanel>

                            </toolkit:Expander>


                        </DataTemplate>
                    </ListBox.ItemTemplate>

Answer 1

Using a collection of viewmodels with the button in the viewmodel solved this. No special magic other than the ObservableCollectionVM