Method OnResize

src/vehicle_gui.cpp:3346–3352

	}

	void OnResize() override
	{
		if (this->viewport != nullptr) {
			NWidgetViewport *nvp = this->GetWidget<NWidgetViewport>(WID_VV_VIEWPORT);
			nvp->UpdateViewportCoordinates(this);
		}
	}

	void UpdateButtonStatus()
	{