diff --git a/src/build_vehicle_gui.cpp b/src/build_vehicle_gui.cpp
--- a/src/build_vehicle_gui.cpp
+++ b/src/build_vehicle_gui.cpp
@@ -63,6 +63,7 @@ static const NWidgetPart _nested_build_v
 	NWidget(NWID_HORIZONTAL),
 		NWidget(WWT_CLOSEBOX, COLOUR_GREY),
 		NWidget(WWT_CAPTION, COLOUR_GREY, BUILD_VEHICLE_WIDGET_CAPTION), SetDataTip(STR_JUST_STRING, STR_TOOLTIP_WINDOW_TITLE_DRAG_THIS),
+		NWidget(WWT_SHADEBOX, COLOUR_GREY),
 		NWidget(WWT_STICKYBOX, COLOUR_GREY),
 	EndContainer(),
 	NWidget(WWT_PANEL, COLOUR_GREY),
@@ -1128,7 +1129,7 @@ struct BuildVehicleWindow : Window {
 				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.
+		if (!this->IsShaded() && needed_height != this->details_height) { // Details window are not high enough, enlarge them.
 			this->details_height = needed_height;
 			this->ReInit();
 			return;