configbody DCS::MotorViewEntry::extraDevice {
if {$itk_option(-extraDevice) == $lastExtraDevice} {
return
}
set m_extraDeviceReady 0
if {$lastExtraDevice != ""} {
::mediator unregister $this $lastExtraDevice scaledPosition
}
if { $itk_option(-extraDevice) != "" } {
set device $itk_option(-extraDevice)
::mediator register $this $device scaledPosition handleExtraDevice
}
set lastExtraDevice $itk_option(-extraDevice)
}