Maxscript control vertex

Hi i'm learning script development in 3ds max, in this basic script i want to move vertex with Spinners, the script work fine at execution but if i change the value of a Spinner nothing is updated, Can someone help me with some code to fix this problem?

Thanks for the attention!

/* Create and rename a basic plane */
BaseUI = Plane realWorldMapSize:on length:10 width:10 lengthsegs:3 widthsegs:3 pos:[0,0,0] isSelected:on
BaseUI.name = "Base UI"

/* Convert the created plane to editable poly */
macros.run "Modifier Stack" "Convert_to_Poly"

/* Delete the middle face */
subobjectLevel = 4
$.EditablePoly.SetSelection #Face #{5}
$.EditablePoly.delete #Face
subobjectLevel = 0

/* Adding attributes rollout */
Attrib = attributes UISettings (
	
	/*  */
	parameters UIParameters rollout:UIRollout(
		LLSParameter type:#float ui:(LLSpinner)
		RLSParameter type:#float ui:(RLSpinner)
		TLSParameter type:#float ui:(TLSpinner)
		BLSParameter type:#float ui:(BLSpinner)
		)
	
	/*  */
	rollout UIRollout "UIRollout"(
		label LLLabel "Left line:" align:#left 
		spinner LLSpinner range:[0,2048,10] fieldWidth:80 type:#float align:#center offset:[10,-20]
		
		label RLLabel "Right line:" align:#left
		spinner RLSpinner range:[0,2048,1] fieldWidth:80 type:#float align:#center offset:[10,-20]
		
		label TLLabel "Top line:" align:#left
		spinner TLSpinner range:[0,2048,1] fieldWidth:80 type:#float align:#center offset:[10,-20]
		
		label BLLabel "Bottom line:" align:#left
		spinner BLSpinner range:[0,2048,1] fieldWidth:80 type:#float align:#center offset:[10,-20]
		)

	)
custAttributes.add $.baseObject Attrib
	
	sss = float_script() 
	sss.script = "$.baseObject.UISettings.BLSParameter"
	for vert in $.Verts[2] do vert.pos.x = sss.value