formMain.xaml

<Window x:Class="SportsTrainingApp.formMain"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:SportsTrainingApp"
        mc:Ignorable="d"
        Title="Система учета спортивных тренировок" Height="200" Width="300" ResizeMode="NoResize" WindowStartupLocation="CenterScreen" Icon="/free-icon-fitness-4729328.png">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="0.2*"></RowDefinition>
            <RowDefinition></RowDefinition>
            <RowDefinition Height="0.2*"></RowDefinition>
            <RowDefinition></RowDefinition>
            <RowDefinition Height="0.2*"></RowDefinition>
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="0.2*"></ColumnDefinition>
            <ColumnDefinition></ColumnDefinition>
            <ColumnDefinition Width="0.2*"></ColumnDefinition>
        </Grid.ColumnDefinitions>
        <Button Grid.Column="1" Grid.Row="1" Content="Вход" Click="Button_Click_1" Margin="10"/>
        <Button Grid.Column="1" Grid.Row="3" Content="Регистрация" Click="Button_Click_2" Margin="10"/>
    </Grid>
</Window>