if (!this->IsShaded()) {

			int needed_height = this->details_height;

			/* Draw details panels. */

			for (int side = 0; side < 2; side++) {

				if (this->sel_engine != INVALID_ENGINE) {

					NWidgetBase *nwi = this->GetWidget<NWidgetBase>(BUILD_VEHICLE_WIDGET_PANEL);

					int text_end = DrawVehiclePurchaseInfo(nwi->pos_x + WD_FRAMETEXT_LEFT, nwi->pos_x + nwi->current_x - WD_FRAMETEXT_RIGHT,

							nwi->pos_y + WD_FRAMERECT_TOP, this->sel_engine);

					needed_height = max(needed_height, text_end - (int)nwi->pos_y + WD_FRAMERECT_BOTTOM);

				}

			if (needed_height != this->details_height) { // Details window are not high enough, enlarge them.

				this->details_height = needed_height;

				this->ReInit();

				return;

			}