diff --git a/Source/UI/UIChangeMaterialWnd.cpp b/Source/UI/UIChangeMaterialWnd.cpp
index f0f0313d..6ae81474 100644
--- a/Source/UI/UIChangeMaterialWnd.cpp
+++ b/Source/UI/UIChangeMaterialWnd.cpp
@@ -1,5 +1,33 @@
 #include "UI/UIChangeMaterialWnd.h"
 
+// OFFSET: 0x005E1080
+// FUNCTION: fn_03871
+void UIChangeMaterialWnd_List::sub_5E1080(int delta) {
+  int64_t newIndex = this->m_selectedIndex + delta;
+  const int count = static_cast<int>(this->m_items.size());
+  const int maxIndex = count - 1;
+
+  if (newIndex >= static_cast<uint32_t>(maxIndex)) {
+    newIndex = maxIndex;
+  }
+
+  int targetIndex = static_cast<int>(newIndex);
+  if (targetIndex < this->m_scrollOffset || targetIndex >= this->m_scrollOffset + this->m_pageSize) {
+    int newOffset = this->m_previousScrollOffset;
+    if (targetIndex < newOffset || targetIndex >= newOffset + this->m_pageSize) {
+      const int candidate = targetIndex - this->m_pageSize + 1;
+      const int limit = count - this->m_pageSize;
+      newOffset = static_cast<unsigned int>(candidate) < static_cast<unsigned int>(limit) ? candidate : limit;
+    }
+
+    this->m_scrollOffset = newOffset;
+    this->sub_5E2A70();
+    this->m_previousScrollOffset = this->m_scrollOffset;
+  }
+
+  this->sub_5E3B80(targetIndex);
+}
+
 // OFFSET: 0x005E1120
 // FUNCTION: fn_03872
 ITEM_INFO* UIChangeMaterialWnd::GetItemAt(int x, int y) {
diff --git a/Source/UI/UIChangeMaterialWnd.h b/Source/UI/UIChangeMaterialWnd.h
index 4850ac98..51f47599 100644
--- a/Source/UI/UIChangeMaterialWnd.h
+++ b/Source/UI/UIChangeMaterialWnd.h
@@ -29,6 +29,20 @@ public:
 class UIChangeMaterialWnd_List : public UIFrameWnd {
 public:
   void Move(int x, int y) override;
+
+  void sub_5E2A70();
+  void sub_5E3B80(int index);
+  void sub_5E1080(int delta);
+
+  /* 00BC */ int m_pageSize;
+  /* 00C0 */ int64_t m_selectedIndex;
+  /* 00C8 */ int unknown_00C8;
+  /* 00CC */ int unknown_00CC;
+  /* 00D0 */ int m_scrollOffset;
+  /* 00D4 */ int m_previousScrollOffset;
+  /* 00D8 */ int unknown_00D8;
+  /* 00DC */ std::vector<int> m_items;
+  /* 00E8 */ unsigned char unknown_00E8[0x10];
 };
 
 #if defined(_WIN32) && !defined(_WIN64)
@@ -36,6 +50,12 @@ static_assert(offsetof(UIChangeMaterialWnd, m_resultX) == 0xC4);
 static_assert(offsetof(UIChangeMaterialWnd, m_resultItem) == 0xD0);
 static_assert(offsetof(UIChangeMaterialWnd, m_materialPos) == 0x1C8);
 static_assert(offsetof(UIChangeMaterialWnd, m_materials) == 0x1F8);
+static_assert(sizeof(UIChangeMaterialWnd_List) == 0xF8);
+static_assert(offsetof(UIChangeMaterialWnd_List, m_pageSize) == 0xBC);
+static_assert(offsetof(UIChangeMaterialWnd_List, m_selectedIndex) == 0xC0);
+static_assert(offsetof(UIChangeMaterialWnd_List, m_scrollOffset) == 0xD0);
+static_assert(offsetof(UIChangeMaterialWnd_List, m_previousScrollOffset) == 0xD4);
+static_assert(offsetof(UIChangeMaterialWnd_List, m_items) == 0xDC);
 #endif
 
 #endif