I'm working on an assembly and I have drawn some sketches on the assembly to help me. Theoretically some of them should be visible, but they are not (visible sketches appear in blue in the feature manager.)

The only way to make them visible is selecting them, but when I try to move an element in the assembly the sketch is not selected any more, therfore I can't see it.

I can show/hide parts in my assembly, no problems for that.

Can anybody help me?