<Application x:Class="WpfApplication13.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:wpfApplication13="clr-namespace:WpfApplication13"
             StartupUri="MainWindow.xaml">
    <Application.Resources>
         <wpfApplication13:MainModel x:Key="MainModel"/>
    </Application.Resources>
</Application>

<Window x:Class="WpfApplication13.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:wpfApplication13="clr-namespace:WpfApplication13"
        xmlns:system="clr-namespace:System;assembly=mscorlib"
        Title="MainWindow" Height="350" Width="525"
        DataContext="{StaticResource MainModel}">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="7*"/>
        </Grid.RowDefinitions>
        <StackPanel Orientation="Horizontal" Grid.Row="0">
            <Button Content="Add new" Margin="5" Padding="5" Click="Button_Click"/>
        </StackPanel>
        <DataGrid Grid.Row="1" ItemsSource="{Binding Pesones}">
            <DataGrid.ItemContainerStyle>
                <Style TargetType="{x:Type DataGridRow}">
                    <Setter Property="wpfApplication13:IsNewHelper.IsNew" Value="{Binding IsNew, Mode=TwoWay}"/>
                    <Setter Property="TextElement.Foreground" Value="Black"/>
                    <Style.Triggers>
                        <Trigger Property="wpfApplication13:IsNewHelper.IsNew" Value="True">
                            <Trigger.EnterActions>
                                <BeginStoryboard>
                                    <Storyboard>
                                        <ColorAnimation Storyboard.TargetProperty="(TextElement.Foreground).(SolidColorBrush.Color)"  To="Red" Duration="0:0:2"/>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="(wpfApplication13:IsNewHelper.IsNew)">
                                            <DiscreteObjectKeyFrame KeyTime="0:0:2" >
                                                <DiscreteObjectKeyFrame.Value>
                                                <system:Boolean>False</system:Boolean>
                                                </DiscreteObjectKeyFrame.Value>
                                            </DiscreteObjectKeyFrame>
                                        </ObjectAnimationUsingKeyFrames>
                                    </Storyboard>
                                </BeginStoryboard>
                            </Trigger.EnterActions>
                            <Trigger.ExitActions>
                                <BeginStoryboard>
                                    <Storyboard>
                                        <ColorAnimation Storyboard.TargetProperty="(TextElement.Foreground).(SolidColorBrush.Color)"  To="Black" Duration="0:0:2"/>
                                    </Storyboard>
                                </BeginStoryboard>
                            </Trigger.ExitActions>
                            </Trigger>
                    </Style.Triggers>
                </Style>
            </DataGrid.ItemContainerStyle>
        </DataGrid>
    </Grid>
</Window>

using System.Windows;

namespace WpfApplication13
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private int _num = 0;
        private void Button_Click(object sender, RoutedEventArgs e)
        {
            var model = (MainModel) DataContext;
            var newPerson = new Person
            {
                Name = "Name " + _num,
                Age = _num, 
                IsNew = true
            };
            model.Pesones.Add(newPerson);
        }
    }
}

using System.Collections.ObjectModel;

namespace WpfApplication13
{
    public class MainModel
    {
        public MainModel()
        {
            Pesones = new ObservableCollection<Person>();
        }

        public ObservableCollection<Person> Pesones { set; get; } 
    }

    public class Person
    {
        public string Name { set; get; }
        public int Age { set; get; }
        public bool IsNew { set; get; }
    }
}