A thumbnail that serves as the value readout for a player-valued slot in a Viewer. Clicking on it allows the user to select a new object for the slot to point to.

	mouse down
	handlesMouseDown: mouseDown:

	initialization	top
	objectToView:viewSelector:putSelector:

	mouse down	top
	handlesMouseDown: Allow the user to respecify this by direct clicking
	mouseDown: Allow the user to respecify this by direct clicking