MSV08-C#: How do I stop two groupboxes from auto-parenting themselves when dragged on top of one another?

private void radioButton1_CheckedChanged(object sender, EventArgs e)
    {
        groupBox1.Location = new System.Drawing.Point(198, 234);
        groupBox2.Location = new System.Drawing.Point(660, 234);
        groupBox1.Visible = true;
        groupBox2.Visible = false;

    }

    private void radioButton2_CheckedChanged(object sender, EventArgs e)
    {
        groupBox1.Location = new System.Drawing.Point(660, 234);
        groupBox2.Location = new System.Drawing.Point(198, 234);
        groupBox1.Visible = false;
        groupBox2.Visible = true;
    }