Problem changing Text Color (inheritance/UserWidget)

Development Getting Started & Setup
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1

I want to do a widget to be used as a component in other widgets.
And the text color cannot be changed.
And the background color doesn’t work until the “inherit” option is Checked and Unchecked.

This is my code:

//-------------------------------------------------
// DEFINITION
//-------------------------------------------------
UCLASS(Abstract, BlueprintType, Blueprintable)
class UEditableTextBlockExt : public UUserWidget
{
	GENERATED_BODY()
	
private:
	UPROPERTY(meta = (BindWidget) )
	UEditableTextBox *TextBox = nullptr;

	UPROPERTY(EditAnywhere)
	FString TheText = FString("Parent");

	UPROPERTY(EditAnywhere)
	bool UseWidgetStyle = false;

	UPROPERTY(EditAnywhere)
	FEditableTextBoxStyle WidgetStyle = FAppStyle::GetWidgetStyle<FEditableTextBoxStyle>("NormalEditableTextBox");

    virtual void NativePreConstruct() override;
}
//-------------------------------------------------
// IMPLEMENTATION
//-------------------------------------------------
void UEditableTextBlockExt::NativePreConstruct()
{
	Super::NativeConstruct();

    TextBox->SetText( FText::FromString(TheText) );

    if (!UseWidgetStyle) return; 
    TextBox->WidgetStyle = WidgetStyle;
}

This is a sample video:

What’s wrong?
Thank you so much!!