CreateMacro default icon

[MinguasBeef]

Is there any way to call CreateMacro and have the icon default to what is occurring like when you manually make a macro?

For example,

if I manually make a macro with

#showtooltip
/cast [mod:shift] Rejuvenation
/cast [nomod:shift] Lifebloom

The icon will change depending on if I have shift pressed.
With CreateMacro, however, it seems to require an icon path. I can't figure out what icon path I should be setting it to for showtooltip to work properly. I tried the default question mark icon, but this just made the icon stay as a question mark.