Listbox resizing automatically, button doesn't - wpf

Question

I've got a ListBox with CheckBoxes in it which resizes automatically when I resize the Window.
I found the CheckedListBox XAML code on StackOverflow I think and I didn't modify it, and I'd like the same thing for all the UI elements.
I've read something about setting Anchors. As I already said, I didn't do anything to the XAML code, neither did I set any Anchors?
Is there anything in the XAML code which I'm not seeing which is responsible for the resizing?
<Grid>
<TextBox Height="23" HorizontalAlignment="Left" Margin="12,28,0,0" Name="textBox1" VerticalAlignment="Top" Width="238" />
<Label Content="Profilname" Height="28" HorizontalAlignment="Left" Margin="12,0,0,0" Name="label1" VerticalAlignment="Top" />
<ListBox ItemsSource="{Binding datasource}" Margin="12,57,12,41" Name="checkedListBox1" Opacity="0.7">
<ListBox.ItemTemplate>
<DataTemplate>
<CheckBox Content="{Binding Path=Item}" IsChecked="{Binding IsChecked}" />
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
<Button Content="save" Margin="12,302,12,12" Name="button3" Click="button3_Click" />
</Grid>
Thanks in advance!

Answer 1

You are doing it like a Canvas, but you are using a Grid.
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
<RowDefinition Height="*" />
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<Label Content="Profilname" Name="label1" Grid.Row="0" />
<TextBox Name="textBox1" Grid.Row="1" />
<ListBox ItemsSource="{Binding datasource}" Name="checkedListBox1" Grid.Row="2" >
<ListBox.ItemTemplate>
<DataTemplate>
<CheckBox Content="{Binding Path=Item}" IsChecked="{Binding IsChecked}" />
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
<Button Content="save" Name="button3" Click="button3_Click" Grid.Row="3" />
</Grid>
See now everything resizes.
You can add margin and padding now as desired for styling.