private void tsmi_Graphics_Click(object sender, EventArgs e)
{
frm_Graphics f_Graphics = new frm_Graphics(DateTime.Now);
f_Graphics.MdiParent = this;
f_Graphics.WindowState = FormWindowState.Maximized;
f_Graphics.Show();
}
private void btn_Graph_Click(object sender, EventArgs e)
{
frm_Graphics f_graph = new frm_Graphics(monthCalendar1.SelectionEnd);
f_graph.MdiParent = this.MdiParent;
f_graph.Show();
f_graph.btn_Draw_Click(this, e);
}