TextBox Autosize

[ESR]

All - I am inserting a textbox via toolbox control selection that I would
like to Autosize only vertically. The horizontal width I have set to match
my form. The problem is when I set these paramaters through the properties
control of the Textbox then close properties and deselect the textbox (with
no text entered yet), it shrinks back to 1x1 (col,row) and expands only
vertically when text is entered (1 col,multi rows). How can I set the width
property and make it stay PRIOR to text being entered. Below are the
properties I have set in the Textbox
AutoSize (True)
MultiLine (True)
WordWrap (True)
Width (500) Which I dragged to match my form

Thanks ESR