private void VentasPorAnio()
{
var ventas = dashboard.ObtenerVentasPorAnio();
Chart chart = this.FindName("MiWinformChart") as Chart;
chart.DataSource = ventas;
chart.Series["series"].XValueMember = "Key";
chart.Series["series"].YValueMembers = "Value";
chart.Series["series"].LabelFormat = "{C}";
//Detalles
chart.Series[0].IsValueShownAsLabel = true;
chart.Palette = ChartColorPalette.Pastel;
//chart.Titles.Add($"Ventas por meses ({DateTime.Now.Year})");
txbTituloChart.Text = $"Ventas por Meses de {DateTime.Now.Year} en Soles";
chart.Legends.Add("");
}