private void HeatChart_GetToolTipText(object sender, System.Windows.Forms.DataVisualization.Charting.ToolTipEventArgs e)
 {
     GetToolTip(e, "кВт");
 }
 private void CharacteristicHeatLossesChart_GetToolTipText(object sender, System.Windows.Forms.DataVisualization.Charting.ToolTipEventArgs e)
 {
     GetToolTip(e, "кВтˑгод");
 }