testWindow = SNew(SWindow)		.Title(LOCTEXT("Asset Window", "Asset Window"))		.ClientSize(FVector2D(30, 20))		.SupportsMaximize(false)		.SupportsMinimize(false)		.SizingRule(ESizingRule::Autosized)		.AutoCenter(EAutoCenter::None)		.IsInitiallyMaximized(false)		.bDragAnywhere(true)		[			textBlock.ToSharedRef()		];	TSharedPtr
     
       TopWindow = FSlateApplication::Get().GetActiveTopLevelWindow();	if (TopWindow.IsValid())	{		//Add as Native		FSlateApplication::Get().AddWindowAsNativeChild(testWindow.ToSharedRef(), TopWindow.ToSharedRef(), true);	}	else	{		//Default in case no top window		FSlateApplication::Get().AddWindow(testWindow.ToSharedRef());	}	GEngine->GameViewport->AddViewportWidgetContent(SNew(SWeakWidget).PossiblyNullContent(testWindow.ToSharedRef()));
     

　　代码片段。备用。