Types confuse me in MAX

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Dark Half

Simply put, there is no definition for r globally

Here (since I wasn't exactly sure what all the field were for and what not, I optimized it a bit based on your general code):

Global R:Radio
Type Radio
	Const S_Radio:int=1
	Const U_Radio:int=0
	
	Global RLST:TList
	Global T_Radio:int
	Global G_Radio:TImage
	
	Field ID:Int
	Field State:Int
	Field X:int,Y:Int
	
	Method Update()
	     If G_Radio <> null then DrawImage(g_radio,x,y,state)
	End Method

	Function Create:Radio(X1:int,Y1:int)
        	Local R:Radio
		if RLST = null then RLST = createlist()
		R = New Radio
		State = U_Radio
		ID = T_Radio+1
		X=X1
		Y=Y1
		Return R
	End Function
End Type

Function CreateGUI()
	R = Radio.Create(5,5)
End Function

R.Update()