Slate SWidgetGallery add to viewport

Development Programming & Scripting UI
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1

Hello everyone,
How can i add SWidgetGallery to viewport? In my HUD i’m using this code (in BeginPlay method):

if (GEngine->IsValidLowLevel())
{
GEngine->GameViewport->AddViewportWidgetContent(SNew(SWeakWidget).PossiblyNullContent(MakeWidgetGallery()));
}

But i got "error LNK2019: unresolved external symbol “class TSharedRef __cdecl MakeWidgetGallery(void)”.
I just want to see all widgets from WidgetGallery in real.