@using DevExpress.Web.Mvc.UI
@Html.DevExpress().CallbackPanel(settings =>
{
    settings.Name = "CallbackPanel";
    settings.CallbackRouteValues = new
    {
        Controller = "Reporting",
        Action = "CallbackPanelPartial"
    };
    //settings.Width = System.Web.UI.WebControls.Unit.Percentage(100);

    //settings.SetContent(() => Html.RenderPartial("_DocumentViewerPartial"));
    //settings.ClientSideEvents.BeginCallback = "OnBeginReportCallback";

    settings.SetContent(() =>
    {
        @Html.DevExpress().WebDocumentViewer(webDocumentViewerSettings =>
        {
            webDocumentViewerSettings.Name = "WebDocumentViewer";
            webDocumentViewerSettings.ClientSideEvents.Init = "WebDocumentViewer_Init";
            webDocumentViewerSettings.ClientSideEvents.CustomizeParameterEditors = "WebDocumentViewer_CustomizeParameterEditors";
        }).Bind(Model).Render();
    });

    settings.ClientSideEvents.BeginCallback = "OnBeginReportCallback";
}).GetHtml()