@asengmanyThat should do it if the part has a Sketch in it. If a part was modeled in the Ordered environment and the sketch was drawn for instance in the Protrusion or Cutout command as a Profile, those are not considered a Sketch feature and will not show.
An idea ... regarding toggling ...
Maybe You used the ShowAll/HideAll menu slightly different, yesterday?
Removing the tick from HideAll is not sufficient to change from HideAll to ShowAll, You need to tick ShowAll.
yes, part is modeled in ordered. i have added a sketch to part. then i open assembly and i want to show the sketch to constrain another part to the sketch. but the sketch does not show.
Thanks all for help. i figured it out. so simple. it was the "as last saved" check box. soon as i checked it to off everything went back to normal.