I found a solution with help of Chad Boles:
public void refreshPendingChanges()
{
Object customIn = null;
Object customOut = null;
//Show TfsPendingChanges
m_applicationObject.ExecuteCommand("View.TfsPendingChanges", "");
//Refresh
m_applicationObject.Commands.Raise("{FFE1131C-8EA1-4D05-9728-34AD4611BDA9}", 4808, ref customIn, ref customOut);
//Activate Source Explorer
m_applicationObject.DTE.Windows.Item("{99B8FA2F-AB90-4F57-9C32-949F146F1914}").Activate(); //I get this GUID recording a Macro.
//Show Conflicts
m_applicationObject.DTE.ExecuteCommand("File.TfsResumeConflictResolution");
}
Thanks for Chad Boles, that said me about File.TfsResumeConflictResolution !