private void btn2_Click(object sender, EventArgs e)
        {
            string seleccionado = "";

            string [] todoText = txb1.Lines;
            int       i        = 0;
            int       indice   = -1;

            seleccionado = this.txb1.SelectedText;


            foreach (string item in todoText)
            {
                if (item == seleccionado && item != "-1")
                {
                    indice = i;
                    break;
                }
                i++;
            }
            seleccionado += " " + indice.ToString();
            MessageBox.Show(seleccionado);


            FrmTempera   frmtemp = new FrmTempera(_miPaleta[indice]); //utilizo la propiedad del INDEXADOR
            DialogResult rta     = frmtemp.ShowDialog();

            if (rta == DialogResult.OK)
            {
                this._miPaleta -= frmtemp.MiTempera;
                this.txb1.Text  = (string)_miPaleta;
            }
        }
 public Form1()
 {
     InitializeComponent();
     this._miPaleta      = 5;
     this.gb1.Text       = "Paleta de Colores";
     this.txb1.Multiline = true; //permite abritlo mas paraque sea un cuadrado
     this.btn1.Text      = "+";
     this.btn2.Text      = "-";
 }
        private void btn1_Click(object sender, EventArgs e)
        {
            FrmTempera   temp = new FrmTempera();
            DialogResult rta  = temp.ShowDialog();

            if (rta == DialogResult.OK)
            {
                this._miPaleta += temp.MiTempera;
                this.txb1.Text  = (string)_miPaleta;
            }
        }