title: How bad binding and converter errors. Should I handle them somehow?
body: <p>I have errors like this because my controls self-bind. It doesn't hurt anything as far as I can tell but I wonder if I should worry about this?</p>
  
  <blockquote>
    <p>System.Windows.Data Error: BindingExpression path error:
    'CanNavigateLast' property not found on
    'Infrastructure.Controls.Lookup.LookupViewModel'
    'Infrastructure.Controls.Lookup.LookupViewModel' (HashCode=21405046).
    BindingExpression: Path='CanNavigateLast'
    DataItem='Infrastructure.Controls.Lookup.LookupViewModel'
    (HashCode=21405046); target element is
    'Infrastructure.Controls.DitatToolbar' (Name=''); target property is
    'CanNavigateLast' (type 'System.Boolean')..</p>
  </blockquote>
  
  <p>Or this. I know it's null and it doesn't seem to cause any problems but I wonder if that's a problem?</p>
  
  <blockquote>
    <p>System.Windows.Data Error: 'MS.Internal.Data.DynamicValueConverter'
    converter failed to convert value 'null' (type 'null');
    BindingExpression: Path='FilterFrom'
    DataItem='Infrastructure.Controls.Lookup.FilterBoxRow'
    (HashCode=57480441); target element is
    'System.Windows.Controls.NumericUpDown' (Name=''); target property is
    'Value' (type 'System.Double').. System.InvalidOperationException:
    Can't convert type null to type System.Double.    at
    MS.Internal.Data.DynamicValueConverter.Convert(Object value, Type
    targetType, Object parameter, CultureInfo culture)    at
    System.Windows.Data.BindingExpression.ConvertToTarget(Object value).</p>
  </blockquote>