Set properties via CheckBox

Hi to all,

In a form, I would change properties of a textbox from visible to not visible after using a checkbox.

Eg.

If NameOfCheckbox =TRUE THEN

     CurrForm.Control100000013.VISIBLE(FALSE);

where Control1000000013 is the name of the textbox.

But I have an error : Control10000000013 isn't defined as a variable in C/AL Globals.

I tried to set that as a variable buta it doens't work yet.

Any suggestion , please?

Thanks

Luciana