<StackPanel Grid.Row="0" Margin="10, 40, 10, 0">


            <TextBlock Text="Email" />
            <TextBox PlaceholderText="abc@gmail.com" Text="abcd@gmail.com" InputScope="EmailSmtpAddress" Name="logintext" MaxLength="30"/>

            <TextBlock Text="Password" />
            <PasswordBox Name="pass2" Password="6F6N" />

            <Grid>
                <Grid.ColumnDefinitions>
                    <ColumnDefinition />
                    <ColumnDefinition />
                </Grid.ColumnDefinitions>
                <Button Content="Login"  />
                <Button Content="Register"  Grid.Column="1" />
            </Grid>
            <TextBlock Text="Forgot Password?" FontSize="20" HorizontalAlignment="Center" Tapped="forgetPassword_Tapped" Foreground="Blue" Margin="0, 10, 0, 0"/>
        </StackPanel>
    </Grid>



    <Grid Name="SecondaryGrid" Visibility="Collapsed"  Background="#BB000000" RenderTransformOrigin="0.5,0.5" >
        <Grid.RenderTransform>
            <CompositeTransform/>
        </Grid.RenderTransform>
        <StackPanel Margin="5" VerticalAlignment="Center" Background="ForestGreen">
            <StackPanel Margin="10">
                <TextBlock Text="Forgot Password"  />
                <TextBlock Text="Email" />
                <TextBox Name="forgotPassTxtBox" PlaceholderText="abc@gmail.com" InputScope="EmailSmtpAddress" MaxLength="30"/>
                <Grid>
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition />
                        <ColumnDefinition />
                    </Grid.ColumnDefinitions>
                    <Button Content="Send" Name="saveBtn"  />
                    <Button Content="Cancel" Name="cancelBtn" Click="cancelBtn_Click"  Grid.Column="1"/>
                </Grid>
            </StackPanel>
        </StackPanel>
    </Grid>



</Grid>

private void forgetPassword_Tapped(object sender, TappedRoutedEventArgs e)
    {
        //Storyboard sb = new Storyboard();


        //sb.Begin();
        //SecondaryGrid.Visibility = Visibility.Visible;

        Grid gd= this.FindName("SecondaryGrid") as Grid;
        DoubleAnimationUsingKeyFrames dm=new DoubleAnimationUsingKeyFrames();
        LinearDoubleKeyFrame l1=new LinearDoubleKeyFrame();
        LinearDoubleKeyFrame l2=new LinearDoubleKeyFrame();



        l1.Value=-703.203;
        l1.KeyTime=TimeSpan.FromSeconds(0);

        l2.Value=0;
        l2.KeyTime=TimeSpan.FromSeconds(1);

        dm.KeyFrames.Add(l1);
        dm.KeyFrames.Add(l2);

        dm.Duration=new Duration(TimeSpan.FromMilliseconds(3000));

        Storyboard sb = new Storyboard();
        sb.Children.Add(dm);



          Storyboard.SetTarget(dm, gd);
          Storyboard.SetTargetName(dm, gd.Name);
          Storyboard.SetTargetProperty(dm, "Opacity");

          sb.Begin();
          SecondaryGrid.Visibility = Visibility.Visible;




    }