Index of the row, before which the added row will
be inserted.
Description
The function allows to add the
row to the list box. The list box is defined by the reference variable refId.
Text of the row is defined by the parameter itemText. If the
parameter beforeItemIdx
is not entered, the item will be added to the end. If it is entered, its
value defines the index of the item, before which the new item will be
inserted.
Rows are numbered from 1...
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