Shows how to create a check box with own Fl_Check_Box widget.
To build this project, open "Terminal" and type following lines:
mkdir build && cd build
cmake ..
start Check_Box.sln
Select Check_Box project and type Ctrl+F5 to build and run it.
mkdir build && cd build
cmake .. -G "Xcode"
open ./Check_Box.xcodeproj
Select Check_Box project and type Cmd+R to build and run it.
mkdir build && cd build
cmake ..
cmake --build . --config Debug
./Check_Box