-    
-    if (GTK_WIDGET_REALIZED(m_widget))
-        win->SetSize( win->m_x, win->m_y, win->m_width, win->m_height );
+
+    int left_border = 0;
+    int right_border = 0;
+    int top_border = 0;
+    int bottom_border = 0;
+
+    /* the default button has a border around it */
+    if (GTK_WIDGET_CAN_DEFAULT(m_widget))
+    {
+        GtkBorder *default_border = NULL;
+        gtk_widget_style_get( m_widget, "default_border", &default_border, NULL );
+        if (default_border)
+        {
+            left_border += default_border->left;
+            right_border += default_border->right;
+            top_border += default_border->top;
+            bottom_border += default_border->bottom;
+            g_free( default_border );
+        }
+        win->MoveWindow(
+            win->m_x - top_border,
+            win->m_y - left_border,
+            win->m_width + left_border + right_border,
+            win->m_height + top_border + bottom_border);
+    }