OptionalcontextOptionaldisabledDisable all controls.
OptionalhideDrop the panel's own sample line.
Called with the new format code whenever the user changes a control.
OptionalonCalled when the user presses Enter (so a hosting dialog can commit/close). Not used in a task pane, where the panel applies live.
OptionalshowShow the one-click formats — accounting, percent, comma, and the decimal nudges — above the category.
The current format code (controlled).
Optional accessor for the cell whose value drives the live preview (and the workbook date-system/locale). Falls back to a category sample.