void mEvDate_Closed(object sender, EventArgs e)
{
mEvDate = null;
}
private void evenementsButton_Click(object sender, RoutedEventArgs e)
{
if (mEvDate == null)
{
mEvDate = new EvenementDate();
mEvDate.Closed += new EventHandler(mEvDate_Closed);
}
mEvDate.Hide();
mEvDate.Show();
}