Page2.xaml

<Page x:Class="WpfApplication1.Page2"
      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
      xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
      xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
      xmlns:local="clr-namespace:WpfApplication1"
      mc:Ignorable="d" 
      d:DesignHeight="300" d:DesignWidth="300"
      Title="Page2">

    <Grid>
        <Grid x:Name="ThirdGrid" Background="#FF414655"  HorizontalAlignment="Stretch" Grid.Column="1">
            <Grid.RowDefinitions>
                <RowDefinition/>
                <RowDefinition/>
                <RowDefinition/>
            </Grid.RowDefinitions>
            <Grid.ColumnDefinitions>
                <ColumnDefinition/>
                <ColumnDefinition/>
                <ColumnDefinition/>
            </Grid.ColumnDefinitions>
            <Button x:Name ="Add" Height="150" Width="150" Grid.Row="0" Grid.Column="0" FontSize="30" Click="Make_new"/>
        </Grid>
        
    </Grid>
</Page>