Shows how to use group and check buttons with Fl_Group and Fl_Check_Button widgets.
To build this project, open "Terminal" and type following lines:
mkdir build && cd build
cmake ..
start Group_And_Check_Button.sln
Select Group_And_Check_Button project and type Ctrl+F5 to build and run it.
mkdir build && cd build
cmake .. -G "Xcode"
open ./Group_And_Check_Button.xcodeproj
Select Group_And_Check_Button project and type Cmd+R to build and run it.
mkdir build && cd build
cmake ..
cmake --build . --config Debug
./Group_And_Check_Button