//---------------Forms responsaveis por carregar formularios no painel = pLoadForm
        private void carregarFormPrincipal(Principal obj)
        {
            //obj = new Principal(1);
            tlpBotoes.Visible = true;
            pLoadForm.Visible = true;

            this.IsMdiContainer = true;
            obj.MdiParent = this;
            obj.Visible = true;
            obj.WindowState = FormWindowState.Maximized;
            obj.StartPosition = FormStartPosition.CenterScreen;

            obj.Size = new System.Drawing.Size(pLoadForm.Size.Width, pLoadForm.Size.Height);
            pLoadForm.Controls.Add(obj);
            obj.Location = new Point(0, 0);
            this.IsMdiContainer = false;
            tlpBotoes.Visible = true;
             /*/  obj // ;= new Principal(1);
                 this.IsMdiContainer = true;
                obj.MdiParent = this;
                obj.Visible = true;
                obj.WindowState = FormWindowState.Maximized;
                obj.StartPosition = FormStartPosition.CenterScreen;

                pFormLoadUp.Visible = false;

            obj.Size = new System.Drawing.Size(pLoadForm.Size.Width, pLoadForm.Size.Height);
            pLoadForm.Controls.Add(obj);
            obj.Location = new Point(0, 0);
            this.IsMdiContainer = false;
            tlpBotoes.Visible = true;
             /*/
        }
        public Fundo()
        {
            InitializeComponent();
            {
                Abertura ab = new Abertura();

                ab.ShowDialog();

                cod_caixa = (short)ab.cod_caixa;
                if (cod_caixa == 0)
                {
                    Application.Exit();
                    this.Close();
                }
                else
                {

                    obj = new Principal(cod_caixa, tlpBotoes);
                    carregarFormPrincipal(obj);
                }
            }
            ordenarTamanhoBotoesCima();
            tlpBotoes.Visible = true;
        }