Am I trying to use it wrong ?

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Yes you are using it wrong…   

 you need to set a value
/comp/gb.qt4/menu/toggle - Gambas Documentation
Gets or Sets if a menu is a toggle menu or not.
You only need to set it once.

Menu_Edit_Current_Account.Toggle = True
Menu_Edit_Current_Account.Checked = bToggleValue

 I have it set to Toggle in the GUI

Do I also have to set it in the code ?

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I guess I just don't understand how Toggle is suppose to work  

I thought it was to change the value from True to False or False to True       or     checked to unchecked    … but I guess that is not the purpose of it

 No it is the switch that turns it into a checkbox menu.

Once it's a toggle menu it works just like a ToggleButton or a CheckBox where you use Value (and/or Checked)

grayghost4 said

I have it set to Toggle in the GUI

Do I also have to set it in the code ?

No. setting it in the IDE has done that for you.  you only need to set it by code to make a new menu created by code be a Toggle Menu

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PS.
I made up "bToggleValue" just to symbolize a boolean toggle value  ,
you'll probably want to use your own variable/condition

I thought that ".toggle" was a shorthand for :

To flip the value from True to False or False to True .
now I know that is not what is for.