Updating listview itemsource clears radiobutton in xamarin forms

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ListView

Xamarin

I have defined a listview and 2 buttons as follows.

<ListView x:Name="lvTest" SeparatorVisibility="None" VerticalOptions="CenterAndExpand"
                              HorizontalOptions="StartAndExpand" HasUnevenRows="True" BackgroundColor="#ffffff">
            <ListView.ItemTemplate>
                <DataTemplate>
                    <ViewCell>
                        <Grid>
                            <Grid.ColumnDefinitions>
                                <ColumnDefinition></ColumnDefinition>
                                <ColumnDefinition></ColumnDefinition>
                            </Grid.ColumnDefinitions>
                            <RadioButton Padding="10,0,0,0" Grid.Column="0" BackgroundColor="White" TextColor="Black"
                                         GroupName="L1" Content="{Binding Description}"
                                         ></RadioButton>
                            <Label Grid.Column="1" Text="{Binding Amount}" TextColor="Black" BackgroundColor="White"
                                   HorizontalTextAlignment="End" Padding="0,0,10,0"></Label>
                        </Grid>
                    </ViewCell>
                </DataTemplate>
            </ListView.ItemTemplate>
        </ListView>
        <Button x:Name="btnAdd" Clicked="btnAdd_Clicked" Text="Add"/>
        <Button x:Name="btnRemove" Clicked="btnRemove_Clicked" Text="Delete"/>

Following is the code in the codebehind class

public partial class Listview : ContentPage
{
    ObservableCollection<CommonModel> temp = new ObservableCollection<CommonModel>();
    CommonModel model;
    public Listview()
    {
        InitializeComponent();
        lvTest.ItemsSource = temp;
    }

    void btnAdd_Clicked(System.Object sender, System.EventArgs e)
    {
        model = new CommonModel();
        model.Description = "Radio 1";
        model.Amount = 100;
        temp.Add(model);
    }

    void btnRemove_Clicked(System.Object sender, System.EventArgs e)
    {
        temp.RemoveAt(0);
    }
}

When i run the application and click on add button the listview gets populated with a row (radiobutton and amount)

Now when i click on delete button the listview gets empty. Up till this every thing is fine.

Now if i click again on add button the listview gets populated with one row but only Amount is seen and radiobutton is missing.

Any help will be appreciated.

What I have tried:

I tried to re assign the listview itemssource property but it did not help