private void recurbutton_Click(object sender, EventArgs e)
{
// Next!
AgendaItemRecur c = (AgendaItemRecur)Enum.Parse(typeof(AgendaItemRecur), recurbutton.Text);
int nc = (int)c + 1;
if(!Enum.IsDefined(typeof(AgendaItemRecur), nc))
nc = 0;
c = (AgendaItemRecur)nc;
recurbutton.Text = c.ToString();
}