Buttons inside DataGrid

My mockup is below. Here's the issue: if the button is in the selected row, then clicking the button will do anything I need it to with the Item bound to that row. If I click a button in a row OTHER THAN the selected row, then I can still only do things with the Item in the selected row. I need to be able to reference rows that aren't selected if the user clicks a button in that row instead of the selected row.

MainPage.xaml:

<Page
    x:Class="ProblemExample.MainPage"
    xmlns="http://ift.tt/w9rHWX;
    xmlns:x="http://ift.tt/zZkFEV;
    xmlns:local="using:ProblemExample"
    xmlns:d="http://ift.tt/PuXO1J;
    xmlns:mc="http://ift.tt/R4RR6u;
    mc:Ignorable="d">

    <Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
        <StackPanel Orientation="Vertical">
            <TextBlock x:Name="ResultText" Text="Result Text" />
            <ListView x:Name="ProblemList">
                <ListView.ItemTemplate>
                    <DataTemplate>
                        <Grid>
                            <Grid.RowDefinitions>
                                <RowDefinition />                            
                            </Grid.RowDefinitions>
                            <Grid.ColumnDefinitions>
                                <ColumnDefinition />
                                <ColumnDefinition />
                                <ColumnDefinition />
                            </Grid.ColumnDefinitions>
                            <TextBlock x:Name="BoundText1" Grid.Row="0" Grid.Column="0" Text="{Binding Data1}" />
                            <TextBlock x:Name="BoundText2" Grid.Row="0" Grid.Column="1" Text="{Binding Data2}" />
                            <Button x:Name="ProblemButton" Grid.Row="0" Grid.Column="2" Content="Problem" Click="ProblemButton_Click" />
                        </Grid>
                    </DataTemplate>
                </ListView.ItemTemplate>
            </ListView>
        </StackPanel>
    </Grid>
</Page>

MainPage.xaml.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices.WindowsRuntime;
using Windows.Foundation;
using Windows.Foundation.Collections;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Controls.Primitives;
using Windows.UI.Xaml.Data;
using Windows.UI.Xaml.Input;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Navigation;

// The Blank Page item template is documented at http://ift.tt/14RBJ0z

namespace ProblemExample
{
    /// <summary>
    /// An empty page that can be used on its own or navigated to within a Frame.
    /// </summary>
    public sealed partial class MainPage : Page
    {
        public MainPage()
        {
            this.InitializeComponent();

            List<SampleData> sample = new List<SampleData>();
            
            for (int i = 1; i <=6; i++)
            {
                string dat1 = "data1" + i.ToString();
                string dat2 = "data2" + i.ToString();
                sample.Add(new SampleData()
                {
                    Data1 = dat1,
                    Data2 = dat2
                });
            }

            ProblemList.ItemsSource = sample;
        }

        private void ProblemButton_Click(object sender, RoutedEventArgs e)
        {
            string selectedInd = ProblemList.SelectedIndex.ToString();
            //string controlInd = (Button)sender.something? <---this is my problem
            ResultText.Text = "Index of selected row is " + selectedInd;
        }
    }

    public class SampleData
    {
        public string Data1 { get; set; }
        public string Data2 { get; set; }
    }
}