The ornamental design for a curtainholdbacktie, as shown and described.
FIG. 1 is a front, left side, top perspective view of a curtain holdback tie showing my new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a left side elevational view thereof;
FIG. 5 is a right side elevational view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof;
FIG. 8 is an enlarged detailed view of the region denoted by the number 8 in FIG. 1;
FIG. 9 is a top plan view thereof when the ends of the curtain holdback tie are brought together for use; and,
FIG. 10 is a top plan view thereof showing the curtain holdback tie in use in connection with curtains.
The curtain holdback tie is shown with a symbolic break in its length. The appearance of any portion of the article between the break lines forms no part of the claimed design.