Set a datagriditem property value everytime a new item is created

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WPF

MVVM

Hi everyone, I have a listview with some checkboxes. I want to be able to populate a DataGridCombobox Itemssource based on the checked selection in the ListView.

What I have tried:

My Model is Order with only 1 property, OrderNumber. In the ViewModel I initialized:

ObservableCollection<order> OrderNumbers will populate the ListView filled with checkboxes.

List<order> SelectedOrders will be a list of selected orders from the said ListView. The application will scan all the ListViewItems for IsChecked Property when an item IsChecked Property changes, adding only items where IsChecked = true to this list.

ObservableCollection<order> SelectedOrderNumbers will be the DataGridItems

OrderNumbers = new ObservableCollection<Order>();
OrderNumbers.Add(new Order("Order No.1"));
OrderNumbers.Add(new Order("Order No.2"));
OrderNumbers.Add(new Order("Order No.3"));

SelectedOrders = new List<Order>();

SelectedOrderNumbers = new ObservableCollection<Order>();

And this is the view:

<Grid>
   <Grid.ColumnDefinitions>
            <ColumnDefinition Width="*"/>
            <ColumnDefinition Width="3*"/>
        </Grid.ColumnDefinitions>

        <ListView ItemsSourche="{Binding OrderNumbers}">
            <ListView.ItemTemplate>
                <DataTemplate>
                    <CheckBox IsChecked="False" Content="{Binding OrderNumber}"/>
                </DataTemplate>
            </ListView.ItemTemplate>
        </ListView>

        <DataGrid Grid.Column="1" ItemsSource="{Binding SelectedOrderNumbers}" AutoGenerateColumns="False">
            <DataGrid.Columns>
                <DataGridComboBoxColumn Header="Order Number" Width="150">
                    <DataGridComboBoxColumn.EditingElementStyle>
                        <Style TargetType="ComboBox">
                            <Setter Property="ItemsSource" Value="{}"/>
                        </Style>
                    </DataGridComboBoxColumn.EditingElementStyle>
                    <DataGridComboBoxColumn.ElementStyle>
                        <Style TargetType="ComboBox">
                            <Setter Property="ItemsSource" Value="{}"/>
                        </Style>
                    </DataGridComboBoxColumn.ElementStyle>
                </DataGridComboBoxColumn>
    </DataGrid>
</Grid>