\twocolitem{\windowstyle{wxCHK\_3STATE}}{Create a 3-state checkbox.}
\twocolitem{\windowstyle{wxCHK\_ALLOW\_3RD\_STATE\_FOR\_USER}}{By default a user can't set a 3-state checkbox
to the third state. It can only be done from code. Using this flags allows the user to set the checkbox to the third state by clicking. }
\twocolitem{\windowstyle{wxCHK\_3STATE}}{Create a 3-state checkbox.}
\twocolitem{\windowstyle{wxCHK\_ALLOW\_3RD\_STATE\_FOR\_USER}}{By default a user can't set a 3-state checkbox
to the third state. It can only be done from code. Using this flags allows the user to set the checkbox to the third state by clicking. }