Access C++ UUserWidget in Designer?

Development Programming & Scripting UI
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1

I made a UUserWidget in C++ (An Item Icon). How can I access it in the UMG Designer List?

The Code:
.h

#pragma once

#include "CoreMinimal.h"
#include "Blueprint/UserWidget.h"
#include "Blueprint/WidgetTree.h"
#include "Components/SizeBox.h"
#include "Components/Border.h"

#include "SlotWidget.generated.h"

UCLASS(Blueprintable)
class MYPROJECT_API USlotWidget : public UUserWidget
{
	GENERATED_BODY()

public:
	UPROPERTY(BlueprintReadWrite, meta = (ExposeOnSpawn = "true"))
		float SlotDimension;

	UPROPERTY(meta = (BindWidget))
		USizeBox* SlotSizeBox;

	UPROPERTY(meta = (BindWidget))
		UBorder* SlotBorder;

protected:
	virtual void NativeConstruct() override;
};

.cpp

#include "SlotWidget.h"

void USlotWidget::NativeConstruct()
{
	//Configure Slot Size Box (Root)
	SlotSizeBox = Cast<USizeBox>(GetRootWidget());
	SlotSizeBox->SetWidthOverride(SlotDimension);
	SlotSizeBox->SetHeightOverride(SlotDimension);

	//Configure Slot Border
	SlotBorder = WidgetTree->ConstructWidget<UBorder>(UBorder::StaticClass(), TEXT("Slot Size Box"));
	SlotSizeBox->AddChild(SlotBorder);
	SlotBorder->SetHorizontalAlignment(EHorizontalAlignment::HAlign_Fill);
	SlotBorder->SetVerticalAlignment(EVerticalAlignment::VAlign_Fill);
	SlotBorder->SetBrushColor(FColor::Blue);
}

Googling around did not really provide me with a concrete answer.

I appreciate the help!