private void FlipColor()
{
this.HoverBGColor = this.HoverBGColor == Color.Empty ? this.ForeColor : this.HoverBGColor;
this.HoverFGColor = this.HoverFGColor == Color.Empty ? this.BackColor : this.HoverFGColor;
this.UnSelFGColor = this.UnSelFGColor == Color.Empty ? this.ForeColor : this.UnSelFGColor;
this.SelBGColor = this.SelBGColor == Color.Empty ? this.ForeColor : this.SelBGColor;
this.SelFGColor = this.SelFGColor == Color.Empty ? this.BackColor : this.SelFGColor;
this.SubBGColor = this.SubBGColor == Color.Empty ? this.BackColor : this.SubBGColor;
this.SubFGColor = this.SubFGColor == Color.Empty ? this.ForeColor : this.SubFGColor;
}