How to DEV form controls on the title bar to draw 3 CheckBox in the state, (cbsUnchecked cbsChecked, cbsGrayed)
Mainly cbsGrayed state,
In the event of an CustomDrawColumnHeader I use
Sender. LookAndFeelPainter. DrawCheckButton (ACanvas, AViewInfo Bounds, cxbsNormal, cbsGrayed);
After shows cbsUnchecked style,
Consult how to draw the Grayed state, use the DEV function also, but the best, and the style of the operating system,