private void checkBox1_CheckedChanged(object sender, System.EventArgs e)
{
PageBox.Enabled = checkBox1.Checked;
XBox.Enabled = checkBox1.Checked;
YBox.Enabled = checkBox1.Checked;
WBox.Enabled = checkBox1.Checked;
HBox.Enabled = checkBox1.Checked;
groupBox1.Enabled = checkBox1.Checked;
}