Panasonic GTWIN Reference Manual page 131

Menus
Leave the "Drawing" dialog open, i.e. do not click [OK], until you have finished
modifying the custom part's size or accompanying image!

Select the row "Change Size" to change the size of the custom part.

Select the row "Edit" to draw or edit the image associated with the custom part.

For lamp parts, select Edit-OFF or Edit-ON to draw the lamp display in its OFF- or
ON-state.
Parts List
The "Parts List" menu command displays a list of all switches, function switches, lamps and
data parts used on the active base screen, including their attributes. Displaying the parts list is
not only handy, but by simply double-clicking in the list, you can reconfigure any part,
including custom parts that may be located behind a bitmap.
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GTWIN Reference Manual