diff --git a/src/gtk/toplevel.cpp b/src/gtk/toplevel.cpp
index 04bb0b4ca0..b91b944750 100644
--- a/src/gtk/toplevel.cpp
+++ b/src/gtk/toplevel.cpp
@@ -345,22 +345,27 @@ bool wxTopLevelWindowGTK::Create( wxWindow *parent,
 
     m_insertCallback = (wxInsertChildFunction) wxInsertChildInTopLevelWindow;
 
-    GtkWindowType win_type = GTK_WINDOW_TOPLEVEL;
-
-    if (style & wxFRAME_TOOL_WINDOW)
-        win_type = GTK_WINDOW_POPUP;
-
-    if (GetExtraStyle() & wxTOPLEVEL_EX_DIALOG)
+    // NB: m_widget may be !=NULL if it was created by derived class' Create,
+    //     e.g. in wxTaskBarIconAreaGTK
+    if (m_widget == NULL)
     {
-        // there is no more GTK_WINDOW_DIALOG in 2.0
-#ifdef __WXGTK20__
-        win_type = GTK_WINDOW_TOPLEVEL;
-#else
-        win_type = GTK_WINDOW_DIALOG;
-#endif
-    }
+        GtkWindowType win_type = GTK_WINDOW_TOPLEVEL;
 
-    m_widget = gtk_window_new( win_type );
+        if (style & wxFRAME_TOOL_WINDOW)
+            win_type = GTK_WINDOW_POPUP;
+
+        if (GetExtraStyle() & wxTOPLEVEL_EX_DIALOG)
+        {
+            // there is no more GTK_WINDOW_DIALOG in 2.0
+#ifdef __WXGTK20__
+            win_type = GTK_WINDOW_TOPLEVEL;
+#else
+            win_type = GTK_WINDOW_DIALOG;
+#endif
+        }
+
+        m_widget = gtk_window_new( win_type );
+    }
 
     if (m_parent && (((GTK_IS_WINDOW(m_parent->m_widget)) &&
 		      (GetExtraStyle() & wxTOPLEVEL_EX_DIALOG)) ||
diff --git a/src/gtk1/toplevel.cpp b/src/gtk1/toplevel.cpp
index 04bb0b4ca0..b91b944750 100644
--- a/src/gtk1/toplevel.cpp
+++ b/src/gtk1/toplevel.cpp
@@ -345,22 +345,27 @@ bool wxTopLevelWindowGTK::Create( wxWindow *parent,
 
     m_insertCallback = (wxInsertChildFunction) wxInsertChildInTopLevelWindow;
 
-    GtkWindowType win_type = GTK_WINDOW_TOPLEVEL;
-
-    if (style & wxFRAME_TOOL_WINDOW)
-        win_type = GTK_WINDOW_POPUP;
-
-    if (GetExtraStyle() & wxTOPLEVEL_EX_DIALOG)
+    // NB: m_widget may be !=NULL if it was created by derived class' Create,
+    //     e.g. in wxTaskBarIconAreaGTK
+    if (m_widget == NULL)
     {
-        // there is no more GTK_WINDOW_DIALOG in 2.0
-#ifdef __WXGTK20__
-        win_type = GTK_WINDOW_TOPLEVEL;
-#else
-        win_type = GTK_WINDOW_DIALOG;
-#endif
-    }
+        GtkWindowType win_type = GTK_WINDOW_TOPLEVEL;
 
-    m_widget = gtk_window_new( win_type );
+        if (style & wxFRAME_TOOL_WINDOW)
+            win_type = GTK_WINDOW_POPUP;
+
+        if (GetExtraStyle() & wxTOPLEVEL_EX_DIALOG)
+        {
+            // there is no more GTK_WINDOW_DIALOG in 2.0
+#ifdef __WXGTK20__
+            win_type = GTK_WINDOW_TOPLEVEL;
+#else
+            win_type = GTK_WINDOW_DIALOG;
+#endif
+        }
+
+        m_widget = gtk_window_new( win_type );
+    }
 
     if (m_parent && (((GTK_IS_WINDOW(m_parent->m_widget)) &&
 		      (GetExtraStyle() & wxTOPLEVEL_EX_DIALOG)) ||