Ksp reference Manual

12.14. hide_part()
hide_part(,)
Hide specific parts of user interface controls

The name of the UI control
User Interface Commands
91
KSP Reference Manual

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Bit by bit combination of the following constants:
$HIDE_PART_BG
{Background of knobs, labels, value edits and tables}
$HIDE_PART_VALUE
{value of knobs}
$HIDE_PART_TITLE
{title of knobs}
$HIDE_PART_MOD_LIGHT 
{mod ring light of knobs}
Examples
on init
declare ui_knob $Knob (0,100,1)
hide_part($Knob,$HIDE_PART_BG...
.or. $HIDE_PART_MOD_LIGHT...
.or. $HIDE_PART_TITLE...
.or. $HIDE_PART_VALUE)
end on
A naked knob
on init
declare ui_label $label_1 (1,1)
set_text ($label_1,"Small Label")
hide_part ($label_1,$HIDE_PART_BG)
end on 
Hide the background of a label. This is also possible with other UI elements.
See Also
$CONTROL_PAR_HIDE
$HIDE_PART_NOTHING
$HIDE_WHOLE_CONTROL