trying to word wrap text in a field on a subform

Private Sub Form_Current()
' MAX AMOUNT OF CHARACTERS UNTIL THE TEXTBOX WILL WORD WRAP
Const INCREASE_LINE_HEIGHT = 50
' ORIGINAL HEIGHT OF THE TEXTBOX
Const ORIGINAL_HEIGHT = 0.2035
' USED TO CONVER INCHES TO TWIPS
Const TWIPS = 1440
' USED TO DETERMINE THE SIZE OF THE TEXT BOX HEIGHT
Dim line_count As Integer
' holds text box text
Dim txtData As String
' holds textbox character length
Dim txtLength As String
' holds the number of times the text size should increase
Dim boxlines As Integer
' assign text box text
txtData = Nz(Me.WWG_Additional_Description, "")
' assign textbox length
txtLength = Len(txtData)

' if the amount of characters is created than increase the line height, then the text box size needs to be increased
' else the textbox goes back to its original state
If txtLength > INCREASE_LINE_HEIGHT Then
' get the amount of new lines required rounded up by 1
   boxlines = Int(txtLength / INCREASE_LINE_HEIGHT) + 1
' resized the textbox by the multiplying  the original height * the number of new lines * twips
   Me.WWG_Additional_Description.Height = ORIGINAL_HEIGHT * boxlines * TWIPS
Else
' default to original state
   boxlines = 1
   Me.WWG_Additional_Description.Height = ORIGINAL_HEIGHT * TWIPS
End If
End Sub