private void btnnn_Load(object sender, EventArgs e)
        {
            _obj = this;


            btnDom.Visible    = false;
            btnTer.Visible    = false;
            btnSab.Visible    = false;
            btnQuar.Visible   = false;
            btnQuin.Visible   = false;
            btnSeg.Visible    = false;
            btnSex.Visible    = false;
            SidePanel.Visible = false;

            IntCard ins = new IntCard();

            ins.Dock = DockStyle.Fill;
            panel4.Controls.Add(ins);
        }
        private void label3_Click(object sender, EventArgs e)
        {
            SidePanel.Visible = false;
            btnDom.Visible    = false;
            btnTer.Visible    = false;
            btnSab.Visible    = false;
            btnQuar.Visible   = false;
            btnQuin.Visible   = false;
            btnSeg.Visible    = false;
            btnSex.Visible    = false;
            _obj = this;

            btnnn.Instance.Pnlpanel.Controls["intcard"].BringToFront();
            IntCard ins = new IntCard();

            ins.Dock = DockStyle.Fill;
            panel4.Controls.Add(ins);

            panelb.Visible = false;
        }