diff --git a/src/widgets/dropdown.cpp b/src/widgets/dropdown.cpp
new file mode 100644
--- /dev/null
+++ b/src/widgets/dropdown.cpp
@@ -0,0 +1,287 @@
+/* $Id$ */
+
+#include "../stdafx.h"
+#include "../openttd.h"
+#include "../strings_type.h"
+#include "../window_gui.h"
+#include "../strings_func.h"
+#include "../strings_type.h"
+#include "../gfx_func.h"
+#include "../window_func.h"
+#include "dropdown_type.h"
+#include "dropdown_func.h"
+
+#include "../table/sprites.h"
+#include "table/strings.h"
+
+StringID DropDownListItem::String() const
+{
+	return STR_NULL;
+}
+
+StringID DropDownListStringItem::String() const
+{
+	return this->string;
+}
+
+StringID DropDownListParamStringItem::String() const
+{
+	for (uint i = 0; i < lengthof(this->decode_params); i++) SetDParam(i, this->decode_params[i]);
+	return this->string;
+}
+
+struct dropdown_d {
+	WindowClass parent_wnd_class;
+	WindowNumber parent_wnd_num;
+	byte parent_button;
+	DropDownList *list;
+	byte selected_index;
+	byte click_delay;
+	bool drag_mode;
+};
+assert_compile(WINDOW_CUSTOM_SIZE >= sizeof(dropdown_d));
+
+static const Widget _dropdown_menu_widgets[] = {
+{      WWT_PANEL,   RESIZE_NONE,     0,     0, 0,     0, 0, 0x0, STR_NULL},
+{  WWT_SCROLLBAR,   RESIZE_NONE,     0,     0, 0,     0, 0, 0x0, STR_0190_SCROLL_BAR_SCROLLS_LIST},
+{   WIDGETS_END},
+};
+
+static int GetDropDownItem(const Window *w)
+{
+	if (GetWidgetFromPos(w, _cursor.pos.x - w->left, _cursor.pos.y - w->top) < 0) return -1;
+
+	int y = _cursor.pos.y - w->top - 2 + w->vscroll.pos * 10;
+	if (y < 0) return -1;
+
+	uint selected_row = y / 10;
+	const DropDownList *list = WP(w, dropdown_d).list;
+
+	if (selected_row >= list->size()) return -1;
+
+	for (DropDownList::const_iterator it = list->begin(); it != list->end(); ++it, selected_row--) {
+		if (selected_row == 0) {
+			const DropDownListItem *item = *it;
+			if (item->masked || item->String() == STR_NULL) return -1;
+			return item->result;
+		}
+	}
+
+	return -1;
+}
+
+static void DropDownMenuWndProc(Window *w, WindowEvent *e)
+{
+	switch (e->event) {
+		case WE_PAINT: {
+			DrawWindowWidgets(w);
+
+			int x = 1;
+			int y = 2 - w->vscroll.pos * 10;
+
+			int sel    = WP(w, dropdown_d).selected_index;
+			int width  = w->widget[0].right - 3;
+			int height = w->widget[0].bottom - 3;
+
+			DropDownList *list = WP(w, dropdown_d).list;
+
+			for (DropDownList::const_iterator it = list->begin(); it != list->end(); ++it) {
+				if (y >= 0 && y <= height) {
+					const DropDownListItem *item = *it;
+					if (item->String() != STR_NULL) {
+						if (sel == item->result) GfxFillRect(x + 1, y, x + width, y + 9, 0);
+
+						DrawStringTruncated(x + 2, y, item->String(), sel == item->result ? TC_WHITE : TC_BLACK, x + width);
+
+						if (item->masked) {
+							GfxFillRect(x, y, x + width, y + 9,
+								(1 << PALETTE_MODIFIER_GREYOUT) | _colour_gradient[_dropdown_menu_widgets[0].color][5]
+							);
+						}
+					} else {
+						int c1 = _colour_gradient[_dropdown_menu_widgets[0].color][3];
+						int c2 = _colour_gradient[_dropdown_menu_widgets[0].color][7];
+
+						GfxFillRect(x + 1, y + 3, x + w->width - 5, y + 3, c1);
+						GfxFillRect(x + 1, y + 4, x + w->width - 5, y + 4, c2);
+					}
+				}
+				y += 10;
+			}
+		} break;
+
+		case WE_CLICK: {
+			if (e->we.click.widget != 0) break;
+			int item = GetDropDownItem(w);
+			if (item >= 0) {
+				WP(w, dropdown_d).click_delay = 4;
+				WP(w, dropdown_d).selected_index = item;
+				SetWindowDirty(w);
+			}
+		} break;
+
+		case WE_MOUSELOOP: {
+			Window *w2 = FindWindowById(WP(w, dropdown_d).parent_wnd_class, WP(w,dropdown_d).parent_wnd_num);
+			if (w2 == NULL) {
+				DeleteWindow(w);
+				return;
+			}
+
+			if (WP(w, dropdown_d).click_delay != 0 && --WP(w,dropdown_d).click_delay == 0) {
+				WindowEvent e;
+				e.event = WE_DROPDOWN_SELECT;
+				e.we.dropdown.button = WP(w, dropdown_d).parent_button;
+				e.we.dropdown.index  = WP(w, dropdown_d).selected_index;
+				w2->wndproc(w2, &e);
+				DeleteWindow(w);
+				return;
+			}
+
+			if (WP(w, dropdown_d).drag_mode) {
+				int item = GetDropDownItem(w);
+
+				if (!_left_button_clicked) {
+					WP(w, dropdown_d).drag_mode = false;
+					if (item < 0) return;
+					WP(w, dropdown_d).click_delay = 2;
+				} else {
+					if (item < 0) return;
+				}
+
+				WP(w, dropdown_d).selected_index = item;
+				SetWindowDirty(w);
+			}
+		} break;
+
+		case WE_DESTROY: {
+			Window *w2 = FindWindowById(WP(w, dropdown_d).parent_wnd_class, WP(w,dropdown_d).parent_wnd_num);
+			if (w2 != NULL) {
+				w2->RaiseWidget(WP(w, dropdown_d).parent_button);
+				w2->InvalidateWidget(WP(w, dropdown_d).parent_button);
+			}
+
+			delete WP(w, dropdown_d).list;
+		} break;
+	}
+}
+
+void ShowDropDownList(Window *w, DropDownList *list, int selected, int button)
+{
+	bool is_dropdown_menu_shown = w->IsWidgetLowered(button);
+
+	DeleteWindowById(WC_DROPDOWN_MENU, 0);
+
+	if (is_dropdown_menu_shown) {
+		delete list;
+		return;
+	}
+
+	w->LowerWidget(button);
+	w->InvalidateWidget(button);
+
+	/* Our parent's button widget is used to determine where to place the drop
+	 * down list window. */
+	const Widget *wi = &w->widget[button];
+
+	/* The preferred position is just below the dropdown calling widget */
+	int top = w->top + wi->bottom + 2;
+	int height = list->size() * 10 + 4;
+
+	/* Check if the status bar is visible, as we don't want to draw over it */
+	Window *w3 = FindWindowById(WC_STATUS_BAR, 0);
+	int screen_bottom = w3 == NULL ? _screen.height : w3->top;
+
+	bool scroll = false;
+
+	/* Check if the dropdown will fully fit below the widget */
+	if (top + height >= screen_bottom) {
+		w3 = FindWindowById(WC_MAIN_TOOLBAR, 0);
+		int screen_top = w3 == NULL ? 0 : w3->top + w3->height;
+
+		/* If not, check if it will fit above the widget */
+		if (w->top + wi->top - height - 1 > screen_top) {
+			top = w->top + wi->top - height - 1;
+		} else {
+			/* ... and lastly if it won't, enable the scroll bar and fit the
+			 * list in below the widget */
+			int rows = (screen_bottom - 4 - top) / 10;
+			height = rows * 10 + 4;
+			scroll = true;
+		}
+	}
+
+	Window *dw = AllocateWindow(
+		w->left + wi[-1].left + 1,
+		top,
+		wi->right - wi[-1].left + 1,
+		height,
+		DropDownMenuWndProc,
+		WC_DROPDOWN_MENU,
+		_dropdown_menu_widgets);
+
+	dw->widget[0].color = wi->color;
+	dw->widget[0].right = wi->right - wi[-1].left;
+	dw->widget[0].bottom = height - 1;
+
+	dw->SetWidgetHiddenState(1, !scroll);
+
+	if (scroll) {
+		/* We're scrolling, so enable the scroll bar and shrink the list by
+		 * the scrollbar's width */
+		dw->widget[1].color  = wi->color;
+		dw->widget[1].right  = dw->widget[0].right;
+		dw->widget[1].left   = dw->widget[1].right - 11;
+		dw->widget[1].bottom = height - 1;
+		dw->widget[0].right -= 12;
+
+		dw->vscroll.cap   = (height - 4) / 10;
+		dw->vscroll.count = list->size();
+	}
+
+	dw->desc_flags = WDF_DEF_WIDGET;
+	dw->flags4 &= ~WF_WHITE_BORDER_MASK;
+
+	WP(dw, dropdown_d).parent_wnd_class = w->window_class;
+	WP(dw, dropdown_d).parent_wnd_num   = w->window_number;
+	WP(dw, dropdown_d).parent_button    = button;
+	WP(dw, dropdown_d).list             = list;
+	WP(dw, dropdown_d).selected_index   = selected;
+	WP(dw, dropdown_d).click_delay      = 0;
+	WP(dw, dropdown_d).drag_mode        = true;
+}
+
+void ShowDropDownMenu(Window *w, const StringID *strings, int selected, int button, uint32 disabled_mask, uint32 hidden_mask)
+{
+	uint result = 0;
+	DropDownList *list = new DropDownList();
+
+	for (uint i = 0; strings[i] != INVALID_STRING_ID; i++) {
+		if (!HasBit(hidden_mask, i)) {
+			list->push_back(new DropDownListStringItem(strings[i], result, HasBit(disabled_mask, i)));
+		}
+		result++;
+	}
+
+	/* No entries in the list? */
+	if (list->size() == 0) {
+		delete list;
+		return;
+	}
+
+	ShowDropDownList(w, list, selected, button);
+}
+
+void HideDropDownMenu(Window *pw)
+{
+	Window **wz;
+	FOR_ALL_WINDOWS(wz) {
+		if ((*wz)->window_class != WC_DROPDOWN_MENU) continue;
+
+		if (pw->window_class == WP(*wz, dropdown_d).parent_wnd_class &&
+				pw->window_number == WP(*wz, dropdown_d).parent_wnd_num) {
+			DeleteWindow(*wz);
+			break;
+		}
+	}
+}
+