Mark,
Whenever I need to hide an investment, I tear my hair out trying to remember where it is hidden on the menu. File | File Operations | Hide ... is simply not where my brain thinks this should be, I suppose.
I intuitively right click on the object of my desires, because right clicking on anything in the Windows world is how you go about manipulating that object.
A right click Hide|Unhide when focused on an individual investment would make a lot of sense, I think. Offering it as a task bar button would also be a nice touch. A cute little half faded icon would make visual sense there.
Thanks for considering it.