Responsive WPF CheckedListBox control

<syncfusion:CheckListBox Height="200" Width="200"> 
            <syncfusion:CheckListBoxItem Content="Austria" /> 
            <syncfusion:CheckListBoxItem Content="Australia"/> 
            <syncfusion:CheckListBoxItem Content="Canada"/> 
            <syncfusion:CheckListBoxItem Content="Finland"/> 
            <syncfusion:CheckListBoxItem Content="NewZealand"/> 
        </syncfusion:CheckListBox>

namespace WpfApp1 
{    
        public partial class MainWindow : Window 
        { 
       public MainWindow() 
       { 
            InitializeComponent(); 
            CheckListBox checkListBox = new CheckListBox(); 
            checkListBox.Height = 200; 
            checkListBox.Width = 200; 
            CheckListBoxItem item1 = new CheckListBoxItem() { Content = "Austria" }; 
            CheckListBoxItem item2 = new CheckListBoxItem() { Content = "Australia" }; 
            CheckListBoxItem item3 = new CheckListBoxItem() { Content = "Canada" }; 
            CheckListBoxItem item4 = new CheckListBoxItem() { Content = "Finland" }; 
            CheckListBoxItem item5 = new CheckListBoxItem() { Content = "NewZealand" }; 
            checkListBox.Items.Add(item1); 
            checkListBox.Items.Add(item2); 
            checkListBox.Items.Add(item3); 
            checkListBox.Items.Add(item4); 
            checkListBox.Items.Add(item5); 
            this.Content = checkListBox; 
       } 
    } 
}