how to synchronize bound comboxes

Hi all
I've created an application that consist of an observable collection of type site
and bound it to DataGrid that its rows consist of comboboxes,my questiin is
how to make the comboboxes of one row tobe synchronized with each other?,by mean
when i select an item from comobox it automaticly select the items in the others comboxes with the same index in the same row.
my site object as below
[code]
[Serializable]
public class CSite:INotifyPropertyChanged,ISerializable
{
public CSite()
{ }
#region Fields Section
string _siteName;
int _siteID;
int _siteZone;
string _siteLocation;
string _siteConfiguration;
#endregion
[field:NonSerialized]
public event PropertyChangedEventHandler PropertyChanged;
void OnPropertyChanged(string probName)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(probName));
}
}

#region Properties Section
public string SiteName
{
get { return _siteName; }
set
{
_siteName = value;
OnPropertyChanged("SiteName");
}
}

public int SiteZone
{
get { return _siteZone; }
set
{
_siteZone = value;
OnPropertyChanged("SiteZone");
}
}


public int SiteID
{
get { return _siteID; }
set
{
_siteID = value;
OnPropertyChanged("SiteID");
}
}

public string SiteLocation
{
get { return _siteLocation; }
set
{
_siteLocation = value;
OnPropertyChanged("SiteLocation");
}
}

public string SiteConfiguration
{
get { return _siteConfiguration; }
set
{
_siteConfiguration = value;
OnPropertyChanged("SiteConfiguration");
}
}
#endregion

#region Serialization Section
//for reading stream
CSite(SerializationInfo info, StreamingContext context)
{
SiteName = (string)info.GetString("siteName");
SiteZone = (int)info.GetInt32("siteZone");
SiteID = (int)info.GetInt32("siteID");
SiteLocation = (string)info.GetString("siteLocation");
SiteConfiguration = (string)info.GetString("siteConfiguration");
}
//for writing stream
public void GetObjectData(SerializationInfo info, StreamingContext context)
{
info.AddValue("siteName", SiteName);
info.AddValue("siteZone", SiteZone);
info.AddValue("siteID", SiteID);
info.AddValue("siteLocation", SiteLocation);
info.AddValue("siteConfiguration", SiteConfiguration);
}
#endregion
}
}
[/code]

my data grid sample
[code]














[/code]
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