diff --git a/LEGO1/lego/legoomni/include/legoutils.h b/LEGO1/lego/legoomni/include/legoutils.h
index f501d1a1..adb09677 100644
--- a/LEGO1/lego/legoomni/include/legoutils.h
+++ b/LEGO1/lego/legoomni/include/legoutils.h
@@ -38,6 +38,7 @@ extern MxAtomId* g_isleScript;
 
 LegoEntity* PickEntity(MxLong, MxLong);
 LegoROI* PickROI(MxLong, MxLong);
+LegoROI* PickParentROI(MxLong p_a, MxLong p_b);
 MxS16 CountTotalTreeNodes(LegoTreeNode* p_node);
 void FUN_1003e050(LegoAnimPresenter* p_presenter);
 Extra::ActionType MatchActionString(const char*);
diff --git a/LEGO1/lego/legoomni/src/actors/ambulance.cpp b/LEGO1/lego/legoomni/src/actors/ambulance.cpp
index 5459c882..ce878893 100644
--- a/LEGO1/lego/legoomni/src/actors/ambulance.cpp
+++ b/LEGO1/lego/legoomni/src/actors/ambulance.cpp
@@ -236,10 +236,26 @@ MxLong Ambulance::HandleEndAction(MxEndActionNotificationParam& p_param)
 	return 1;
 }
 
-// STUB: LEGO1 0x100367c0
+// FUNCTION: LEGO1 0x100367c0
+// FUNCTION: BETA10 0x100230bf
 MxLong Ambulance::HandleButtonDown(LegoControlManagerEvent& p_param)
 {
-	// TODO
+	if (m_unk0x170 == 1) {
+		LegoROI* roi = PickROI(p_param.GetX(), p_param.GetY());
+
+		if (roi != NULL && !strcmpi(roi->GetName(), "ps-gate")) {
+			m_unk0x170 = 3;
+			return 1;
+		}
+
+		roi = PickParentROI(p_param.GetX(), p_param.GetY());
+
+		if (roi != NULL && !strcmpi(roi->GetName(), "gd")) {
+			m_unk0x170 = 3;
+			return 1;
+		}
+	}
+
 	return 0;
 }
 
diff --git a/LEGO1/lego/legoomni/src/common/legoutils.cpp b/LEGO1/lego/legoomni/src/common/legoutils.cpp
index 7efa5a96..3b6b1267 100644
--- a/LEGO1/lego/legoomni/src/common/legoutils.cpp
+++ b/LEGO1/lego/legoomni/src/common/legoutils.cpp
@@ -34,7 +34,24 @@
 // FUNCTION: LEGO1 0x1003dd70
 LegoROI* PickROI(MxLong p_a, MxLong p_b)
 {
-	return (LegoROI*) VideoManager()->Get3DManager()->GetLego3DView()->Pick(p_a, p_b);
+	LegoVideoManager* videoManager = VideoManager();
+	Lego3DView* view = videoManager->Get3DManager()->GetLego3DView();
+	return (LegoROI*) view->Pick(p_a, p_b);
+}
+
+// FUNCTION: LEGO1 0x1003dd90
+// FUNCTION: BETA10 0x100d3449
+LegoROI* PickParentROI(MxLong p_a, MxLong p_b)
+{
+	LegoVideoManager* videoManager = VideoManager();
+	Lego3DView* view = videoManager->Get3DManager()->GetLego3DView();
+	LegoROI* roi = (LegoROI*) view->Pick(p_a, p_b);
+
+	while (roi != NULL && roi->GetParentROI() != NULL) {
+		roi = (LegoROI*) roi->GetParentROI();
+	}
+
+	return roi;
 }
 
 // STUB: LEGO1 0x1003ddc0