Snippet of xaml code:
<GroupBox VerticalAlignment="Top" Height="58" Margin="0,0,0,0">
<StackPanel Orientation="Vertical">
<Label Content="Players"
Margin="0,0,0,0"
HorizontalAlignment="Center" />
<TextBox x:Name="gTBx"
Margin="0,-2,0,0"
Width="30"
HorizontalAlignment="Center" />
</StackPanel>
</GroupBox>
I see snipboard.io/WAQwDB.jpg
It doesn't like it when I add "Content" to the <GroupBox> => snipboard.io/AY4IqU.jpg
<GroupBox VerticalAlignment="Top" Height="58" Margin="0,0,0,0" Content="Number">