diff --git a/src/group_gui.cpp b/src/group_gui.cpp
--- a/src/group_gui.cpp
+++ b/src/group_gui.cpp
@@ -105,20 +105,20 @@ static const NWidgetPart _nested_group_w
 			NWidget(WWT_PANEL, COLOUR_GREY, GRP_WIDGET_DEFAULT_VEHICLES), SetMinimalSize(200, 13), EndContainer(),
 			NWidget(NWID_HORIZONTAL),
 				NWidget(WWT_MATRIX, COLOUR_GREY, GRP_WIDGET_LIST_GROUP), SetMinimalSize(188, 0), SetDataTip(0x701, STR_GROUPS_CLICK_ON_GROUP_FOR_TOOLTIP),
-						SetFill(true, false), SetResize(0, 1),
+						SetFill(1, 0), SetResize(0, 1),
 				NWidget(WWT_SCROLL2BAR, COLOUR_GREY, GRP_WIDGET_LIST_GROUP_SCROLLBAR),
 			EndContainer(),
 			NWidget(NWID_HORIZONTAL),
-				NWidget(WWT_PUSHIMGBTN, COLOUR_GREY, GRP_WIDGET_CREATE_GROUP), SetMinimalSize(24, 25), SetFill(false, true),
+				NWidget(WWT_PUSHIMGBTN, COLOUR_GREY, GRP_WIDGET_CREATE_GROUP), SetMinimalSize(24, 25), SetFill(0, 1),
 						SetDataTip(SPR_GROUP_CREATE_TRAIN, STR_GROUP_CREATE_TOOLTIP),
-				NWidget(WWT_PUSHIMGBTN, COLOUR_GREY, GRP_WIDGET_DELETE_GROUP), SetMinimalSize(24, 25), SetFill(false, true),
+				NWidget(WWT_PUSHIMGBTN, COLOUR_GREY, GRP_WIDGET_DELETE_GROUP), SetMinimalSize(24, 25), SetFill(0, 1),
 						SetDataTip(SPR_GROUP_DELETE_TRAIN, STR_GROUP_DELETE_TOOLTIP),
-				NWidget(WWT_PUSHIMGBTN, COLOUR_GREY, GRP_WIDGET_RENAME_GROUP), SetMinimalSize(24, 25), SetFill(false, true),
+				NWidget(WWT_PUSHIMGBTN, COLOUR_GREY, GRP_WIDGET_RENAME_GROUP), SetMinimalSize(24, 25), SetFill(0, 1),
 						SetDataTip(SPR_GROUP_RENAME_TRAIN, STR_GROUP_RENAME_TOOLTIP),
-				NWidget(WWT_PANEL, COLOUR_GREY, GRP_WIDGET_EMPTY1), SetMinimalSize(92, 25), SetFill(true, true), EndContainer(),
-				NWidget(WWT_PUSHIMGBTN, COLOUR_GREY, GRP_WIDGET_REPLACE_PROTECTION), SetMinimalSize(24, 25), SetFill(false, true),
+				NWidget(WWT_PANEL, COLOUR_GREY, GRP_WIDGET_EMPTY1), SetMinimalSize(92, 25), SetFill(1, 1), EndContainer(),
+				NWidget(WWT_PUSHIMGBTN, COLOUR_GREY, GRP_WIDGET_REPLACE_PROTECTION), SetMinimalSize(24, 25), SetFill(0, 1),
 						SetDataTip(SPR_GROUP_REPLACE_OFF_TRAIN, STR_GROUP_REPLACE_PROTECTION_TOOLTIP),
-				NWidget(WWT_PANEL, COLOUR_GREY, GRP_WIDGET_EMPTY2), SetMinimalSize(12, 25), SetFill(false, true), EndContainer(),
+				NWidget(WWT_PANEL, COLOUR_GREY, GRP_WIDGET_EMPTY2), SetMinimalSize(12, 25), SetFill(0, 1), EndContainer(),
 			EndContainer(),
 		EndContainer(),
 		/* right part */
@@ -129,19 +129,19 @@ static const NWidgetPart _nested_group_w
 				NWidget(WWT_PANEL, COLOUR_GREY, GRP_WIDGET_EMPTY_TOP_RIGHT), SetMinimalSize(12, 12), SetResize(1, 0), EndContainer(),
 			EndContainer(),
 			NWidget(NWID_HORIZONTAL),
-				NWidget(WWT_MATRIX, COLOUR_GREY, GRP_WIDGET_LIST_VEHICLE), SetMinimalSize(248, 0), SetDataTip(0x701, STR_NULL), SetResize(1, 1), SetFill(true, false),
+				NWidget(WWT_MATRIX, COLOUR_GREY, GRP_WIDGET_LIST_VEHICLE), SetMinimalSize(248, 0), SetDataTip(0x701, STR_NULL), SetResize(1, 1), SetFill(1, 0),
 				NWidget(WWT_SCROLLBAR, COLOUR_GREY, GRP_WIDGET_LIST_VEHICLE_SCROLLBAR),
 			EndContainer(),
 			NWidget(NWID_HORIZONTAL),
-				NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, GRP_WIDGET_AVAILABLE_VEHICLES), SetMinimalSize(106, 12), SetFill(false, true),
+				NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, GRP_WIDGET_AVAILABLE_VEHICLES), SetMinimalSize(106, 12), SetFill(0, 1),
 						SetDataTip(0x0, STR_VEHICLE_LIST_AVAILABLE_ENGINES_TOOLTIP),
-				NWidget(WWT_DROPDOWN, COLOUR_GREY, GRP_WIDGET_MANAGE_VEHICLES_DROPDOWN), SetMinimalSize(118, 12), SetFill(false, true),
+				NWidget(WWT_DROPDOWN, COLOUR_GREY, GRP_WIDGET_MANAGE_VEHICLES_DROPDOWN), SetMinimalSize(118, 12), SetFill(0, 1),
 						SetDataTip(STR_VEHICLE_LIST_MANAGE_LIST, STR_VEHICLE_LIST_MANAGE_LIST_TOOLTIP),
-				NWidget(WWT_PUSHIMGBTN, COLOUR_GREY, GRP_WIDGET_STOP_ALL), SetMinimalSize(12, 12), SetFill(false, true),
+				NWidget(WWT_PUSHIMGBTN, COLOUR_GREY, GRP_WIDGET_STOP_ALL), SetMinimalSize(12, 12), SetFill(0, 1),
 						SetDataTip(SPR_FLAG_VEH_STOPPED, STR_VEHICLE_LIST_MASS_STOP_LIST_TOOLTIP),
-				NWidget(WWT_PUSHIMGBTN, COLOUR_GREY, GRP_WIDGET_START_ALL), SetMinimalSize(12, 12), SetFill(false, true),
+				NWidget(WWT_PUSHIMGBTN, COLOUR_GREY, GRP_WIDGET_START_ALL), SetMinimalSize(12, 12), SetFill(0, 1),
 						SetDataTip(SPR_FLAG_VEH_RUNNING, STR_VEHICLE_LIST_MASS_START_LIST_TOOLTIP),
-				NWidget(WWT_PANEL, COLOUR_GREY, GRP_WIDGET_EMPTY_BOTTOM_RIGHT), SetMinimalSize(0, 12), SetFill(true, true), SetResize(1, 0), EndContainer(),
+				NWidget(WWT_PANEL, COLOUR_GREY, GRP_WIDGET_EMPTY_BOTTOM_RIGHT), SetMinimalSize(0, 12), SetFill(1, 1), SetResize(1, 0), EndContainer(),
 				NWidget(WWT_RESIZEBOX, COLOUR_GREY, GRP_WIDGET_RESIZE),
 			EndContainer(),
 		EndContainer(),