Anyone have an example of how to use a SortComparer for a field?  I have a field that shows Heights, but is being sorted as String.  Therefore, after clicking the Height column header, I get results like (where I really want to sort numerically, not by string).  I cannot just change the underlying value type to integer either, it must remain strings, but I figure i could Parse the values to an int in the SortComparer or something?  How do i interupt the sorting when the user clicks the column header?

9 ft

13 ft

12 ft

11 ft

10 ft

Here is the Xaml:

<Window x:Class="XamDataGridSorting.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:local="clr-namespace:XamDataGridSorting"
        Title="MainWindow" Height="350" Width="525" 
xmlns:igDP="http://infragistics.com/DataPresenter">
    <Grid>
        <igDP:XamDataGrid DataSource="{Binding}" Name="xamDataGrid1" 
VerticalAlignment="Top" >
            
        </igDP:XamDataGrid>
    </Grid>
</Window>

Here is the code:

namespace XamDataGridSorting
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            ObservableCollection<Tree> data = 
new ObservableCollection<Tree>();
            data.Add(new Tree() { Name = "Apple", Height = "9 ft" });
            data.Add(new Tree() { Name = "Pear", Height = "10 ft" });
            data.Add(new Tree() { Name = "Cherry", Height = "11 ft" });
            data.Add(new Tree() { Name = "Palm", Height = "12 ft" });
            data.Add(new Tree() { Name = "Oak", Height = "13 ft" });
            this.DataContext = data;
        }
    }
 
    public class Tree
    {
        public string Height { get; set; }
        public string Name { get; set; }
    }
}