Keep a Control vertically and horizontally at center of its container
<p>I've attempted to create a custom Panel with a border around it, whose Color can be changed in order to "highlight" the Panel under certain conditions. </p>

<p>The Panel will also need to communicate certain information via text. For this purpose, I've added a Label to the Panel. I've tried the prescribed methods for centering the Label but for some reason it always puts it to the top-left of the Panel. I can't set the Label's Dock to Fill because that covers up the custom border that's been created. So I need to make it so that the Label fits within the border.</p>

<p>The Label's Anchor is set to None and its Location is</p>

<pre><code>new Point((ClientSize.Width - Size.Width)/2, (ClientSize.Height - Size.Height)/2);
</code></pre>

<p>The code for the custom Panel is:</p>

<pre><code>public class CustomPanel : Panel
{
    public CustomPanel(int borderThickness, Color borderColor) : base()
    {
        SetStyle(ControlStyles.AllPaintingInWmPaint | 
                 ControlStyles.UserPaint | 
                 ControlStyles.OptimizedDoubleBuffer | 
                 ControlStyles.ResizeRedraw, true);

        BackColor = SystemColors.ActiveCaption;
        BorderStyle = BorderStyle.FixedSingle;
        Size = new Size(45, 45);
        Margin = new Padding(0);
        BorderThickness = borderThickness;
        BorderColor = borderColor;
    }

    protected override void OnPaint(PaintEventArgs e)
    {
        base.OnPaint(e);

        if (BorderStyle == BorderStyle.FixedSingle)
        {
            int halfThickness = BorderThickness / 2;
            using (Pen p = new Pen(BorderColor, BorderThickness))
            {
                e.Graphics.DrawRectangle(p, new Rectangle(halfThickness,
                     halfThickness,
                     ClientSize.Width - BorderThickness, ClientSize.Height - BorderThickness));
            }
        }
    }

    public int BorderThickness { get; set; }
    public Color BorderColor { get; set; }
}
</code></pre>

<p>And the Form code is:</p>

<pre><code>private void NewPanelTest_Load(object sender, EventArgs e)
{
    CustomPanel cp = new CustomPanel(3, Color.Black);

    // Create new Label
    Label info = new Label()
    {
        Size = new Size(30, 30),
        Text = "Info",
        Anchor = AnchorStyles.None,
        TextAlign = ContentAlignment.MiddleCenter,
        Enabled = false,
        Font = new Font("Microsoft Sans Serif", 6),
        ForeColor = Color.White,
        Location = new Point(ClientSize.Width/2 - Width/2, ClientSize.Height/2 - Height/2)
    };

    cp.Controls.Add(info);

    this.Controls.Add(cp);
}
</code></pre>

<p>EDIT: I've looked at similar questions asked and tried changing the Label's properties but with no results.</p>

<pre><code>// Create new Label
Label info = new Label()
{
    // Same code as before

    // Different code
    Left = (this.ClientSize.Width - Size.Width) / 2,
    Top = (this.ClientSize.Height - Size.Height) / 2,
    //Location = new Point(ClientSize.Width/2 - Width/2, ClientSize.Height/2 - Height/2)
};
</code></pre>

<p>I've also tried changing the Panel's Padding, also with no results.</p>

<pre><code>Padding = new Padding(5);
</code></pre>

<p>EDIT: Attempt at programatically placing Label in center of Panel (yields results of X = 0, Y = 0)</p>

<pre><code>// Create new Label
Label info = new Label()
{
    // Same code as before (excluding "Left", "Top", and "Location")
};
int X = (info.ClientSize.Width - info.Width) / 2;
int Y = (info.ClientSize.Height - info.Height) / 2;
info.Location = new Point(X, Y);
MessageBox.Show(info.Location.ToString());

cp.Controls.Add(info);
</code></pre>