+- disabling a parent window also disables all of its children (as in wxGTK)
+- multiple events avoided in wxComboBox
+- tooltip asserts avoided for read-only wxComboBox
+- fixed a race condition during a thread exit and a join
+- fixed a condition where a thread can hang during message/event processing
+- increased space between wxRadioBox label and first radio button
+- don't fail to register remaining window classes if one fails to register
+- wxFontDialog effects only turned on if a valid colour was
+ provided in wxFontData