static void OnComplexFieldNameChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
GridColumn column = (GridColumn)d;
if (!string.IsNullOrEmpty((string)e.OldValue))
{
column.ClearValue(ComplexPathProperty);
}
column.FieldName = (string)e.NewValue;
if (!string.IsNullOrEmpty(column.FieldName))
{
SetComplexPath(column, new ComplextPath(column.FieldName));
}
}
