"When TAdvFocusHelper is used and a control has focus, it will be marked by TAdvFocusHelper"
Yes.
But AdvOfficeCheckBox1 cannot get the focus !
It's TabStop=false, and the default the OK button. The OK buttons must get the TAdvFocusHelper's marker when start the program, instead of AdvOfficeCheckBox1.
When push the TAB, the OK button get the marker, and after, the AdvOfficeCheckBox1 never get the marker, it's normal..