protected override void OnPaint(PaintEventArgs e)
{
this.PaintBorder(e.Graphics, VisibleBorders, BorderColor, BorderDashStyle);
PostPaint?.Invoke(this, e);
}
protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint(e);
e.Graphics.Clear(SystemColors.ActiveBorder);
PostPaint?.Invoke(this, e);
}