var msgs = from g in xDoc.Descendants().Descendants("msgs")
                           select new
                           {
                               messageNum = g.Element("msg_number").Value,

 
AddHandler popupCanvas.MouseLeftButtonDown, AddressOf MouseLeftButtonDown



Private Sub MouseLeftButtonDown(ByVal sender As Object, ByVal e As MouseButtonEventArgs)
        HidePopup()
    End Sub

popupCanvas.MouseLeftButtonDown += (sender, e) => { HidePopup(); };

strArray = new string[arraySize];
XmlReader reader = XmlReader.Create(new StringReader(your XML));
while (reader.Read())
{
  if (reader.NodeType == XmlNodeType.Element)
  { 
    strArray[cnt] = reader.Name;
    cnt++;
  }
}

<?xml version="1.0" encoding="utf-8"?>
<OrderDocument>
  <rows>
    <OrderDocumentRow>
        <number>1</number>
        <Cost>
          <code>11</code>
          <type>0</type>

[\w{1,32}]

<?xml version="1.0" encoding="utf-8"?>
<Settings>
  <MapInfo>
    <text>item1</text>
    <positionLeft>55.426666259765625</positionLeft>
    <positionTop>163.94999694824219</positionTop>
    <original>item1</original>
  </MapInfo>

<?xml version='1.0' encoding='utf-8' ?>
<Purchase_Info>
<Purchase_Order_Proposal>
    <Purchase_Order_Proposal id='1'>pop1</Purchase_Order_Proposal>
    <Purchase_Order_Proposal id='2'>pop2</Purchase_Order_Proposal>
    <Purchase_Order_Proposal id='3'>pop3</Purchase_Order_Proposal>