How to read XML using Linq with Single root and nested child and siblings in it

How to read the elements inside nested childs and siblings in a single root using LINQ

My Xml file format

<Config xmlns="urn:Configuration">
    <Group name="Model" version="1.01" source="Barium">
      <Group tag="MeterSystem" type="option">
        <Entry readonly="1" type="string">PW_TP_STANDARD</Entry>
      </Group>
      <Group tag="Detector" type="option">
        <Entry readonly="1" type="string">SD770</Entry>
      </Group>
      <Group tag="VXtypeOpt" type="option">
        <Entry type="string">Vx88</Entry>
      </Group>
      <Group tag="FlowDirectionOpt" type="option">
        <Entry type="string">Upwards</Entry>
      </Group>
  </Group>

  <Group name="Config">
    <Entry name="Configuration name" type="string">Default</Entry>
  </Group>

My C# Code to read the Xml structure

List<string> fpxmls = System.IO.Directory.GetFiles(@_fpxml_path, "*.xml",
                                                   SearchOption.AllDirectories)
                                         .ToList<string>();
foreach (var _file in fpxmls)
{
    var MyFPXMLDoc = XDocument.Load(@_file);
    var Config = (from config in MyFPXMLDoc .Descendants("Group")
                  select new
                  {
                      source= (string) config.Attribute("source"),
                      // How should I proceed?
                      // Using descendants doesnt give any items to  Config
                      // How to extract VxMeterSize= (string)g.(?).(?)// shud return Vx88
                  });
    ...
}