public String getTooltip(Address addr, int x, int y) {
		if (markerDescriptor != null) {
			MarkerLocation loc = new MarkerLocation(this, program, addr, x, y);
			return markerDescriptor.getTooltip(loc);
		}
		return null;
	}
Get the tooltip for the marker at the specified index and address

@param addr address of item to navigate to
@param x x location of cursor
@param y y location of cursor

@return tool tip string, null if no tool tip
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/marker/MarkerSetImpl.java