IUIHostShowDialogAsync - метод

Function ShowDialogAsync ( 
	title As String,
	content As Object,
	Optional initializeWindowActionAsync As Func(Of Window, CancellationToken, ValueTask) = Nothing,
	Optional modalDialog As Boolean = true,
	Optional closeOnEscapeKey As Boolean = false,
	Optional cancellationToken As CancellationToken = Nothing,
	ParamArray buttons As UIButton()
) As ValueTask

ValueTask ShowDialogAsync(
	String^ title, 
	Object^ content, 
	Func<Window^, CancellationToken, ValueTask>^ initializeWindowActionAsync = nullptr, 
	bool modalDialog = true, 
	bool closeOnEscapeKey = false, 
	CancellationToken cancellationToken = CancellationToken(), 
	... array<UIButton^>^ buttons
)

abstract ShowDialogAsync : 
        title : string * 
        content : Object * 
        ?initializeWindowActionAsync : Func<Window, CancellationToken, ValueTask> * 
        ?modalDialog : bool * 
        ?closeOnEscapeKey : bool * 
        ?cancellationToken : CancellationToken * 
        buttons : UIButton[] 
(* Defaults:
        let _initializeWindowActionAsync = defaultArg initializeWindowActionAsync null
        let _modalDialog = defaultArg modalDialog true
        let _closeOnEscapeKey = defaultArg closeOnEscapeKey false
        let _cancellationToken = defaultArg cancellationToken new CancellationToken()
*)
-> ValueTask