Tswitch/TcheckBox with 3 states

Hello,

In TMS UI Pack miss an interesting component Tswitch/Tcheckbox with 3 state :

  • On (Checked=true)
  • Off (Checked=false)
  • Unknown (checked=nil)
    So a property that return the State is needed for one of these state.
    Maybe a property to set if state unknown is possible.