diff --git a/samples/main.cpp b/samples/main.cpp
index 0c0c9b1..84c5c18 100644
--- a/samples/main.cpp
+++ b/samples/main.cpp
@@ -38,7 +38,7 @@ static void renderDialog(const char *title, Context &ctx) {
     Widgets::panel(ctx, NextPanelId, 0, title, 240, 90, 120, 250, nullptr);
 }
 
-static int quit(uint32_t id, void *data) {
+int quit(uint32_t id, void *data) {
     if (data == nullptr) {
         return ErrorCode;
     }
diff --git a/src/tinyui.h b/src/tinyui.h
index edb70e6..08a3d2c 100644
--- a/src/tinyui.h
+++ b/src/tinyui.h
@@ -264,20 +264,22 @@ struct CallbackI {
     /// @brief The default class constructor.
     CallbackI() :
             mfuncCallback{ nullptr }, mInstance(nullptr) {
-        for (size_t i=0; i<Events::NumEvents; ++i) {
-            mfuncCallback[i] = nullptr;
-        }
+        clear();
     }
 
     CallbackI(funcCallback mbDownFunc, void *instance) :
             mfuncCallback{ nullptr }, mInstance(instance) {
-        for (size_t i = 0; i < Events::NumEvents; ++i) {
-            mfuncCallback[i] = nullptr;
-        }
+        clear();
         mfuncCallback[Events::MouseButtonDownEvent] = mbDownFunc;
     }
 
     ~CallbackI() = default;
+
+    void clear() {
+        for (size_t i = 0; i < Events::NumEvents; ++i) {
+            mfuncCallback[i] = nullptr;
+        }
+    }
 };
 
 using EventCallbackArray = std::vector<CallbackI*>;