public void Execute()
{
// In the case of the first execution, the Chrono has already been added to the extra drawings list.
if (m_Chrono != null)
{
if (m_Metadata.ExtraDrawings.IndexOf(m_Chrono) == -1)
{
m_Metadata.AddChrono(m_Chrono);
m_DoInvalidate();
}
}
}