Because of IB_Combox can't detected focused property
, i modify below line for detected IB_Combox if its current control

'IBG_Custom.IMP'

Line 1331 original
if ((Controls[ii] as TWinControl).Focused) then begin

Change to
if ((Controls[ii] as TWinControl).Focused)
or (Controls[ii] = Screen.activeform.activecontrol) // Added
then begin

Is it Correct ?