implement cleanup functions

1 files changed, 2 insertions, 0 deletions

diff --git a/alf/alfbutton.cpp b/alf/alfbutton.cpp
index 2df9fc9..729e7ee 100644
--- a/alf/alfbutton.cpp
+++ b/alf/alfbutton.cpp
@@ -65,6 +65,8 @@ ALF__ButtonSubclassProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam, UINT
                                        p->left, p->top + padding,
                                        p->right - p->left, p->bottom - p->top - 2*padding,
                                        SWP_NOZORDER|SWP_NOACTIVATE);
+    } else if (uMsg == WM_DESTROY) {
+        app->compatFn->RemoveWindowSubclass(hwnd, ALF__ButtonSubclassProc, 0);
     }
 
     return app->compatFn->DefSubclassProc(hwnd, uMsg, wParam, lParam);