Nope. Grid is simply one of a number of panel types that are designed to layout their children in specific way. Grids are used extensively in many different and often nested ways. They are lightweight and therefore do not carry loads of baggage that may or may not get used, such as in this a bunch of properties to determine borders on "cells".
To create a border on each cell simply use the Border
control:-
<Grid>
<Grid.Resources>
<Style x:Key="borderStyle" TargetType="Border">
<Setter Property="BorderBrush" Value="Black" />
<Setter Property="BorderThickness" Value="1" />
<Setter Property="Padding" Value="2" />
</Style>
</Grid.Resource>
<Grid.RowDefinitions>
<RowDefinition Height="*" />
<RowDefinition Height="*" />
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<Border Style="{StaticResource borderStyle}" Grid.Row="0" Grid.Column="0">
<!-- Cell 0.0 content here -->
</Border>
<Border Style="{StaticResource borderStyle}" Grid.Row="0" Grid.Column="1">
<!-- Cell 0.1 content here -->
</Border>
<Border Style="{StaticResource borderStyle}" Grid.Row="1" Grid.Column="0">
<!-- Cell 1.0 content here -->
</Border>
<Border Style="{StaticResource borderStyle}" Grid.Row="1" Grid.Column="1">
<!-- Cell 1.1 content here -->
</Border>
</Grid>