Steema Central

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        private bool Clicked(int x, int y)
        {
            int tmp = colorLine1.Axis.Horizontal ? x : y;
            int ClickTolerance = 3;
            if (Math.Abs(tmp - colorLine1.Axis.CalcPosValue(colorLine1.Value)) < ClickTolerance)
            {
                Rectangle r = tChart1.Chart.ChartRect;
                return colorLine1.Axis.Horizontal ? (y >= r.Y) && (y <= r.Bottom) : (x >= r.X) && (x <= r.Right);
            }
            else return false;
        }

        private void tChart1_MouseClick(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Right && Clicked(e.X, e.Y))
                tChart1.Text = "Show Popup";
            else tChart1.Text = "Not show Popup";
        }