ControlEdit IsPassword

Does anyone know if it is possible to set the password flag in the XML file for an edit type control?

I have tried
<IsPassword>1</IsPassword> lowercase and the case shown
<IsPassword>true</IsPassword> lowercase and the case shown
<hidden>true</hidden>
hidden=”true”
hidden=”1″
option=”hidden”

None of which work. The documentation states it can be done when creating an ControlEdit through python, so I would assume there has to be a way to hard code it int he XML file.

ControlEdit (x, y, width, height, label[, font, textColor, disabledColor, alignment, focusTexture, noFocusTexture])

x : integer – x coordinate of control.
y : integer – y coordinate of control.
width : integer – width of control.
height : integer – height of control.
label : string or unicode – text string.
font : [opt] string – font used for label text. (e.g. ‘font13’)
textColor : [opt] hexstring – color of enabled label’s label. (e.g. ‘0xFFFFFFFF’)
disabledColor : [opt] hexstring – color of disabled label’s label. (e.g. ‘0xFFFF3300’)
alignment : [opt] integer – alignment of label – *Note, see xbfont.h
focusTexture : [opt] string – filename for focus texture.
noFocusTexture : [opt] string – filename for no focus texture.
isPassword : [opt] bool – if true, mask text value.