<Grid  Height="530" Grid.Row="1" VerticalAlignment="Top" Margin="0,30,0,0">
            <ListBox Margin="0,0,0,0" Name="TransactionList">
                <ListBox.ItemTemplate>
                    <DataTemplate>
                        <Button  Width="460" Height="150" Click="user_click" Name="rowButton" >
                            <Button.Content>
                                <StackPanel Orientation="Horizontal" Height="auto" Width="400">
                                    <Image Width="80" Height="80" Source="{Binding Type}"></Image>
                                    <StackPanel Orientation="Vertical" Height="150" Margin="20,0,0,0">
                                        <StackPanel Orientation="Horizontal" Height="40">
                                            <TextBlock Width="100" FontSize="22" Text="Name :" Height="40" ></TextBlock>
                                            <TextBlock Width="auto" FontSize="22" Text="{Binding Name}" Height="40" ></TextBlock>
                                        </StackPanel>
                                        <StackPanel Orientation="Horizontal" Height="40">
                                            <TextBlock Width="100" FontSize="22" Text="Date :" Height="40" ></TextBlock>
                                            <TextBlock Width="100" FontSize="22" Text="{Binding Date}" Height="40" ></TextBlock>
                                        </StackPanel>
                                        <StackPanel Orientation="Horizontal" Height="40">
                                            <TextBlock Width="100" FontSize="22" Text="Amount :" Height="40" ></TextBlock>
                                            <TextBlock Width="auto" FontSize="22" Text="{Binding Amount}" Height="40" ></TextBlock>
                                            <TextBlock Width="auto" FontSize="22" Text=" $" Height="40" ></TextBlock>
                                        </StackPanel>
                                    </StackPanel>
                                </StackPanel>
                            </Button.Content>
                        </Button>
                    </DataTemplate>
                </ListBox.ItemTemplate>
            </ListBox>
        </Grid>

Button button1 = sender as Button;
            button1.Backgorund = new SolidColorBrush(Colors.Red);