Index: source/gui/CGUI.cpp
===================================================================
--- source/gui/CGUI.cpp
+++ source/gui/CGUI.cpp
@@ -159,6 +159,11 @@
 					ret = pNearest->SendEvent(GUIM_MOUSE_PRESS_RIGHT, "mouserightpress");
 				break;
 
+			case SDL_BUTTON_MIDDLE:
+				if (pNearest)
+					ret = pNearest->SendEvent(GUIM_MOUSE_PRESS_MIDDLE, "mousemiddlepress");
+				break;
+
 			default:
 				break;
 			}
@@ -198,6 +203,18 @@
 						ret = pNearest->SendEvent(GUIM_MOUSE_RELEASE_RIGHT, "mouserightrelease");
 				}
 				break;
+			case SDL_BUTTON_MIDDLE:
+				if (pNearest)
+				{
+					double timeElapsed = timer_Time() - pNearest->m_LastClickTime[SDL_BUTTON_MIDDLE];
+					pNearest->m_LastClickTime[SDL_BUTTON_MIDDLE] = timer_Time();
+
+					if (timeElapsed < SELECT_DBLCLICK_RATE)
+						ret = pNearest->SendEvent(GUIM_MOUSE_DBLCLICK_MIDDLE, "mousemiddledoubleclick");
+					else
+						ret = pNearest->SendEvent(GUIM_MOUSE_RELEASE_MIDDLE, "mousemiddlerelease");
+				}
+				break;
 			}
 
 			// Reset all states on all visible objects
Index: source/gui/GUIbase.h
===================================================================
--- source/gui/GUIbase.h
+++ source/gui/GUIbase.h
@@ -63,13 +63,16 @@
 	GUIM_MOUSE_PRESS_LEFT,
 	GUIM_MOUSE_PRESS_LEFT_ITEM,
 	GUIM_MOUSE_PRESS_RIGHT,
+	GUIM_MOUSE_PRESS_MIDDLE,
 	GUIM_MOUSE_DOWN_LEFT,
 	GUIM_MOUSE_DOWN_RIGHT,
 	GUIM_MOUSE_DBLCLICK_LEFT,
 	GUIM_MOUSE_DBLCLICK_LEFT_ITEM, // Triggered when doubleclicking on a list item
 	GUIM_MOUSE_DBLCLICK_RIGHT,
+	GUIM_MOUSE_DBLCLICK_MIDDLE,
 	GUIM_MOUSE_RELEASE_LEFT,
 	GUIM_MOUSE_RELEASE_RIGHT,
+	GUIM_MOUSE_RELEASE_MIDDLE,
 	GUIM_MOUSE_WHEEL_UP,
 	GUIM_MOUSE_WHEEL_DOWN,
 	GUIM_SETTINGS_UPDATED,	// SGUIMessage.m_Value = name of setting