Unfortunately the location of the visibility toggle icon cannot be controlled. Same for its look. So using a separate textbox to control its location is about the only way that I can think of. Have you tried putting both boxes in the same rectangle? Not sure if it will help, but it's worth trying.
If you think having extra control over the icon is a must, feel free to open a suggestion through [Microsoft Connect][1].
[1]: http://connect.microsoft.com/SQLServer
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