ASP.NET Core MVC コントロールヘルプ
Modal プロパティ (Popup)

C1.AspNetCore.Mvc アセンブリ > C1.Web.Mvc 名前空間 > Popup クラス : Modal プロパティ
Gets or sets a value that determines whether the Popup should be displayed as a modal dialog.
シンタックス
'宣言
 
Public Property Modal As System.Boolean
public System.bool Modal {get; set;}
解説
Modal dialogs show a dark backdrop that makes the Popup stand out from other content on the page.If you want to make a dialog truly modal, also set the HideTrigger property to None, so users won't be able to click the backdrop to dismiss the dialog. In this case, the dialog will close only if the close method is called or if the user presses the Escape key.
参照

Popup クラス
Popup メンバ