private void invertButtonClick(object sender, EventArgs e)
        {
            PixelColor c = Data.Layers[0].FrontColor;

            Data.Layers[0].FrontColor = Data.Layers[0].BackColor;
            Data.Layers[0].BackColor  = c;
            UzorView.DrawView();
        }
        public void MirrorButtonClick(object sender, EventArgs e)
        {
            if (!uzor.MirrorMode)
            {
                mirrorButton.Source = "mirrorOffButton.png";
            }
            else
            {
                mirrorButton.Source = "mirrorOnButton.png";
            }

            this.uzor.MirrorMode           = !uzor.MirrorMode;
            this.mirrorIndicator.IsVisible = this.uzor.MirrorMode;
            UzorView.DrawView();
        }