Add "On Top" to the context menu of "Manage Stickies" window

Choosing "On Top" from the context menu should move the sticky to the "front" (that means it should be displayed on top of other "On Top" stickies which may hide it.)

Thanks in advance.

BTW - Here's a tip for the Desktop Section of "Manage Stickies" (for those who haven't noticed it) if a sticky on the Desktop is "On Top" mode and you double-click its "line" from the Desktop section of "Manage Stickies" the sticky itself is displayed at the "front".
This tip works only on the Desktop Section of "Manage Stickies" and not on other sections like Stacks section.