Reading a variable whoose name is in another variable

[Acidic]

Lets say I have

Type Step
    x As Byte
    y As Byte
    up As Boolean
    down As Boolean
    left As Boolean
    right As Boolean
End Type
 
Dim a As String
Dim cell22 As Step
cell22.x = 1
cell22.y = 5
cell22.up = True
cell22.down = False
cell22.left = False
cell22.right = True
 
a = "cell22"

how can I msgbox the variable whoose name is in a?
in JavaScript it would be: eval(a).x, but I know VB doesn't have eval(), so What can I do?