private void button_ok_Click(object sender, EventArgs e)
{
m_collide = this.checkBox_collide.Checked;
m_friction = (double)this.numeric_friction.Value;
m_rolling_friction = (double)this.numeric_rolling_friction.Value;
m_spinning_friction = (double)this.numeric_spinning_friction.Value;
m_restitution = (double)this.numeric_restitution.Value;
m_collision_margin = (double)this.numeric_collision_margin.Value;
m_collision_envelope = (double)this.numeric_collision_envelope.Value;
m_collision_family = this.comboBox_collision_family.SelectedIndex;
}