private void RadioToggle()
{
if (percentageRadio.Active) {
percentageSpinner.Sensitive = true;
widthSpinner.Sensitive = false;
heightSpinner.Sensitive = false;
aspectCheckbox.Sensitive = false;
} else {
percentageSpinner.Sensitive = false;
widthSpinner.Sensitive = true;
heightSpinner.Sensitive = true;
aspectCheckbox.Sensitive = true;
}
}