For my WPF project in C #, I have to create a menu state that should look like the image below

So far i have created

XAML code for this window:
<UserControl x:Class="MainWindow"
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"
mc:Ignorable="d"
d:DesignHeight="600" d:DesignWidth="800">
<Grid Background="White" HorizontalAlignment="Stretch" VerticalAlignment="Stretch">
<Grid.RowDefinitions>
<RowDefinition Height="125"/>
<RowDefinition Height="100"/>
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="200*"/>
<ColumnDefinition Width="400*"/>
<ColumnDefinition Width="200*"/>
</Grid.ColumnDefinitions>
<Label Grid.Row="0" Grid.Column="1" HorizontalAlignment="Center" FontFamily="Franklin Gothic Heavy">
<Viewbox>
<TextBlock>Title</TextBlock>
</Viewbox>
</Label>
<Grid Grid.Row="2" Grid.Column="1" HorizontalAlignment="Stretch" VerticalAlignment="Stretch">
<Grid.RowDefinitions>
<RowDefinition Height="50"/>
<RowDefinition Height="15"/>
<RowDefinition Height="50"/>
<RowDefinition Height="15"/>
<RowDefinition Height="50"/>
<RowDefinition Height="15"/>
<RowDefinition Height="50"/>
<RowDefinition Height="15"/>
<RowDefinition Height="50"/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="300*"/>
</Grid.ColumnDefinitions>
<Button Grid.Row="0" Grid.Column="0" FontFamily="Franklin Gothic Medium">
<Viewbox><TextBlock>State</TextBlock></Viewbox>
</Button>
<Button Grid.Row="2" Grid.Column="0" FontFamily="Franklin Gothic Medium">
<Viewbox><TextBlock>State</TextBlock></Viewbox>
</Button>
<Button Grid.Row="4" Grid.Column="0" FontFamily="Franklin Gothic Medium">
<Viewbox><TextBlock>State</TextBlock></Viewbox>
</Button>
<Button Grid.Row="6" Grid.Column="0" FontFamily="Franklin Gothic Medium">
<Viewbox><TextBlock>State</TextBlock></Viewbox>
</Button>
<Button Grid.Row="8" Grid.Column="0" FontFamily="Franklin Gothic Medium">
<Viewbox><TextBlock>State</TextBlock></Viewbox>
</Button>
</Grid>
</Grid>
</UserControl>
The problem with this window is that these components (the label and buttons with their contents) do not scale properly. I want, when I resize the window, I want these components to be proportional to the window. Not sure if grid layout is a problem, but how can I fix this component scale properly.
EDIT:
Ok, so I followed your instructions and I like the results (everything seems to scale quite well)

but I have two more minor issues :
1) XAML , . ( ) , , "" .
, <RowDefinition Height="*"/>. , .
2) , , 1, 2 *,... . , , , . , ( ) ?
, ?
.
<UserControl x:Class="TypeRacer_Client.state.MenuState"
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"
mc:Ignorable="d"
d:DesignHeight="600" d:DesignWidth="800">
<Grid Background="White" HorizontalAlignment="Stretch" VerticalAlignment="Stretch">
<Grid.RowDefinitions>
<RowDefinition Height="*"/>
<RowDefinition Height="*"/>
<RowDefinition Height="3*"/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="2*"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<Label Grid.Row="0" Grid.Column="1" HorizontalAlignment="Center" FontFamily="Franklin Gothic Heavy">
<Viewbox>
<TextBlock>Title</TextBlock>
</Viewbox>
</Label>
<Grid Grid.Row="2" Grid.Column="1" HorizontalAlignment="Stretch" VerticalAlignment="Stretch">
<Grid.RowDefinitions>
<RowDefinition Height="*"/>
<RowDefinition Height="15"/>
<RowDefinition Height="*"/>
<RowDefinition Height="15"/>
<RowDefinition Height="*"/>
<RowDefinition Height="15"/>
<RowDefinition Height="*"/>
<RowDefinition Height="15"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<Button Grid.Row="0" Grid.Column="0" FontFamily="Franklin Gothic Medium">
<Viewbox><TextBlock>State</TextBlock></Viewbox>
</Button>
<Button Grid.Row="2" Grid.Column="0" FontFamily="Franklin Gothic Medium">
<Viewbox><TextBlock>State</TextBlock></Viewbox>
</Button>
<Button Grid.Row="4" Grid.Column="0" FontFamily="Franklin Gothic Medium">
<Viewbox><TextBlock>State</TextBlock></Viewbox>
</Button>
<Button Grid.Row="6" Grid.Column="0" FontFamily="Franklin Gothic Medium">
<Viewbox><TextBlock>State</TextBlock></Viewbox>
</Button>
<Button Grid.Row="8" Grid.Column="0" FontFamily="Franklin Gothic Medium">
<Viewbox><TextBlock>State</TextBlock></Viewbox>
</Button>
</Grid>
</Grid>
</UserControl>