How to use the @bentley/ui-framework.ModalDialogManager.openDialog function in @bentley/ui-framework

      iconSpec: "icon-placeholder", labelKey: "SampleApp:buttons.openCalculator", execute: () => { ModalDialogManager.openDialog(); },
    });

      iconSpec: "icon-placeholder", labelKey: "SampleApp:buttons.openRadial", execute: () => { ModalDialogManager.openDialog(this.radialMenu()); },
    });

             ModalDialogManager.openDialog(this.radialMenu())} />
             ModalDialogManager.openDialog(this.testPopup())} />

      execute: () => ModalDialogManager.openDialog(AppTools._messageBox(MessageSeverity.None, IModelApp.i18n.translate("SampleApp:buttons.successMessageBox"))),
    });

             ModalDialogManager.openDialog(this.modalDialog())} />
             ModalDialogManager.openDialog(this.radialMenu())} />

             ModalDialogManager.openDialog(this.testPopup())} />

      iconSpec: "icon-placeholder", labelKey: "SampleApp:buttons.spinnerTestDialog", execute: () => { ModalDialogManager.openDialog(); },
    });