public static IModuleBuilder<IWinApplicationBuilder> AddCharts(
    this IModuleBuilder<IWinApplicationBuilder> builder
)

<ExtensionAttribute>
Public Shared Function AddCharts(
    builder As IModuleBuilder(Of IWinApplicationBuilder)
) As IModuleBuilder(Of IWinApplicationBuilder)

using DevExpress.ExpressApp.ApplicationBuilder;
using DevExpress.ExpressApp.Win.ApplicationBuilder;
// ...
public class ApplicationBuilder : IDesignTimeApplicationFactory {
    public static WinApplication BuildApplication(string connectionString) {
        var builder = WinApplication.CreateBuilder();
        builder.UseApplication<MySolutionWindowsFormsApplication>();
        builder.Modules
            // ...
            .AddCharts();
        // ...
    }
    // ...
}