wxCONTROL_SELECTED = 0x00000020, // selected item in e.g. listbox
wxCONTROL_CHECKED = 0x00000040, // (check/radio button) is checked
wxCONTROL_CHECKABLE = 0x00000080, // (menu) item can be checked
+ wxCONTROL_UNDETERMINED = wxCONTROL_CHECKABLE, // (check) undetermined state
wxCONTROL_FLAGS_MASK = 0x000000ff,