The ornamental design for a curtainholdbacktie, as shown and described.
FIG. 1 is a 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 right-side elevational view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof;
FIG. 8 is another perspective view thereof;
FIG. 9 is an enlarged view of encircled region in FIG. 8;
FIG. 10 is a top plan view thereof when the opposite ends of the tie are connected together; and,
FIG. 11 is a front elevational view of how the ties are utilized in order to retain curtains in their held back position.
The broken lines represent an environment of use and form no part of the claim. The broken away symbols in the drawings indicate that any portion of the article beyond what is shown forms no part of the claim.