public void Loaded()
{
mw = (MainWindow)this.Owner;
btnAdd.Click += AddClient_Click;
//DGVlients.DataContext = mw.getListClient();
DGVlients.ItemsSource = mw.getListClient();
DGProspects.ItemsSource = mw.getListProspect();
DGEntretiens.ItemsSource = mw.getListHistorique();
}