diff --git a/src/common/wincmn.cpp b/src/common/wincmn.cpp
index 23f8a98a83..d01360f22f 100644
--- a/src/common/wincmn.cpp
+++ b/src/common/wincmn.cpp
@@ -891,12 +891,11 @@ bool wxWindowBase::Enable(bool enable)
 
 bool wxWindowBase::IsShownOnScreen() const
 {
-#ifdef __WXMAC__
-    return ((wxWindowMac*)this)->MacIsReallyShown();
-#else
+    // A window is shown on screen if it itself is shown and so are all its
+    // parents. But if a window is toplevel one, then its always visible on
+    // screen if IsShown() returns true, even if it has a hidden parent.
     return IsShown() &&
-           (GetParent() == NULL || GetParent()->IsShownOnScreen());
-#endif
+           (IsTopLevel() || !GetParent() || GetParent()->IsShownOnScreen());
 }
 
 // ----------------------------------------------------------------------------