Databinding in XBAP throws reflection error

I have a listbox that I'm binding to a collection of objects.

In the code behind, I get a list of the jobs and bind it to the listbox items source:

List<JobEntity> jobList = new List<JobEntity>();
Job j = new Job();
jobList = j.LoadJobs(pageSize, pageIndex);
lbxJobs.ItemsSource = jobList;

In the xaml, I then try and access some of the properties of the job.

   <ListBox.ItemTemplate>
        <DataTemplate>
            <WrapPanel>
                <TextBlock Text="{Binding Path=Title}" Margin="5 0" />
                <TextBlock Text="{Binding Path=HiringCompany}" Margin="5 0" />
            </WrapPanel>
        </DataTemplate>
    </ListBox.ItemTemplate>

This works fine for a normal wpf application, but as an xbap app it throws an error that basically says it can't get the value because Reflection Permissions were denied.

System.Windows.Data Error: 16 : Cannot
get 'HiringCompany' value (type
'String') from '' (type 'JobEntity').
BindingExpression:Path=HiringCompany;
DataItem='JobEntity'
(HashCode=64844482); target element is
'TextBlock' (Name=''); target property
is 'Text' (type 'String')
TargetInvocationException:'System.Reflection.TargetInvocationException:
Property accessor 'HiringCompany' on
object 'JobSearch.Classes.JobEntity'
threw the following
exception:'JobSearch.Classes.JobEntity.get_HiringCompany()'
—> System.MethodAccessException: JobSearch.Classes.JobEntity.get_HiringCompany()
—> System.Security.SecurityException:
Request for the permission of type
'System.Security.Permissions.ReflectionPermission,
mscorlib, Version=2.0.0.0,
Culture=neutral,
PublicKeyToken=b77a5c561934e089'
failed

Has any one run into this before or found a workaround for this error?