//the method adds a figure to the FigureList class, and draws the desired figure (Square)
private void button3_Click(object sender, EventArgs e)
{
figlist.figarray.Add("Squ");
using (grx = Graphics.FromImage(bmp))
{
grx.DrawRectangle(Pens.Black, figlist.GetSquare(Convert.ToInt32(textBox12.Text), Convert.ToInt32(textBox11.Text), Convert.ToInt32(textBox10.Text), Convert.ToInt32(textBox9.Text)));
}
pictureBox1.Image = bmp;
}