Hatching inside a spline

Hi, is it any work around to hatch a spline? I tried to explode, etc. Nothing works.

I use them as knifemaker there is no way to draw some pieces without polylines.

Regards

Peter

I just played around a bit:
Made a closed polyline, failure.
Exploded that polyline, selected all elements, success.

Made a polyline, starting and ending at normal straight lines so a closed contour is shaped. Exploded polyline part. Selected whole shape, failure.
Where exploded polyline meets straight lines, at both ends, did "trim two" for last ex polyline sement and adjacant straight line. Success.