How to add Checkbox Legends for DevExpress Dashboard Chart Item

To display custom check boxes, it is necessary to access the inner ChartControl used to display the item as described in the Access to Underlying Controls help topic. Note that the chart item displays different series in the legend and chart. You will need to handle the ChartControl.LegendItemChecked event that is raised when the legend series is checked and hide the corresponding series in the chart manually. Please refer to the following code snippet demonstrating this functionality:

C#
private void dashboardDesigner1_DashboardItemControlCreated(object sender, DevExpress.DashboardWin.DashboardItemControlEventArgs e) {  
    if (e.ChartControl != null) {  
        e.ChartControl.Legend.MarkerMode = DevExpress.XtraCharts.LegendMarkerMode.CheckBoxAndMarker;  
        e.ChartControl.LegendItemChecked += ChartControl_LegendItemChecked;  
    }  
}  
private void ChartControl_LegendItemChecked(object sender, DevExpress.XtraCharts.LegendItemCheckedEventArgs e) {  
    ChartControl chart = (ChartControl)sender;  
    if (e.CheckedElement is Series) {  
        var series = (Series)e.CheckedElement;  
        chart.Series[series.LegendText].Visible = e.NewCheckState;  
    }  
}