public void ShowViewInPopupWindow(
    View view,
    Action okDelegate = null,
    Action cancelDelegate = null,
    string okButtonCaption = null,
    string cancelButtonCaption = null,
    Frame sourceFrame = null,
    Action<ShowViewParameters> configureDelegate = null
)

Public Sub ShowViewInPopupWindow(
    view As View,
    okDelegate As Action = Nothing,
    cancelDelegate As Action = Nothing,
    okButtonCaption As String = Nothing,
    cancelButtonCaption As String = Nothing,
    sourceFrame As Frame = Nothing,
    configureDelegate As Action(Of ShowViewParameters) = Nothing
)

using DevExpress.ExpressApp;
using DevExpress.ExpressApp.Actions;
using DevExpress.ExpressApp.DC;
// ...
public class MyDialogController : ViewController {
    public MyDialogController() {
        SimpleAction action = new SimpleAction(this, "Email", "View");
        action.Execute += Action_Execute;
    }
    private void Action_Execute(object sender, SimpleActionExecuteEventArgs e) {
        IObjectSpace objectSpace = Application.CreateObjectSpace<MyDialog>();
        MyDialog myDialogObject = objectSpace.CreateObject<MyDialog>();
        myDialogObject.Message = "Do you want to send an email?";
        DetailView dialogView = Application.CreateDetailView(objectSpace, myDialogObject);
        Application.ShowViewStrategy.ShowViewInPopupWindow(dialogView,
            () => Application.ShowViewStrategy.ShowMessage("Done."),
            () => Application.ShowViewStrategy.ShowMessage("Cancelled."),
            null, null, this.Frame
        );
    }
}

[DomainComponent]
public class MyDialog {
    public string Message { get; set; }
}

using DevExpress.ExpressApp;
using DevExpress.ExpressApp.Actions;
using DevExpress.Persistent.Base;
using MySolution.Module.BusinessObjects;
namespace MySolution.Blazor.Server.Controllers;
public class CustomBlazorController :ObjectViewController<DetailView, Contact> {
    public CustomBlazorController() {
        var myAction = new SimpleAction(this, "MyBlazorAction", PredefinedCategory.Edit);
        myAction.Execute += MyAction_Execute;
    }
    private void MyAction_Execute(object sender, SimpleActionExecuteEventArgs e) {
        var objectSpace = Application.CreateObjectSpace(typeof(Contact));
        var listView = Application.CreateListView(typeof(Contact), true);
        Application.ShowViewStrategy.ShowViewInPopupWindow(listView,
            () => {
                var mainViewObject = ((Contact)View.CurrentObject);
                var popupViewObjects = listView.SelectedObjects;
                Application.ShowViewStrategy.ShowMessage($"The main view's current object is {mainViewObject.FirstName}. The number of selected objects in the pop-up view is: {popupViewObjects.Count}");
            },
            () => Application.ShowViewStrategy.ShowMessage("Cancelled."),
            null, null, this.Frame,
            (showViewParameters) => {
                var dialogController = (DialogController)showViewParameters.Controllers.First(ctrl => ctrl is DialogController);
                dialogController.AcceptAction.SelectionDependencyType = SelectionDependencyType.RequireSingleObject;
            }
        );
    }
}

var view= Helper.Application.CreateDetailView(objectSpace, editedObject, true);
    Helper.Application.ShowViewStrategy.ShowViewInPopupWindow(view);
}

filterDetailView.Caption = string.Format("Filter for the {0} ListView", View.Caption);
    Application.ShowViewStrategy.ShowViewInPopupWindow(filterDetailView, () => FilterDetailView_OK(filterDetailView));
}