If the object is a textbox, use the [||] “Never Delete” Marker Token.
Q++Studio will never delete a non-textbox, unless it is grouped to a textbox which is deleted. So, if the object is not a textbox, make sure it is not grouped with a textbox which may be deleted. Remember that if you use the hide outside days option in "Grid Options", some textboxes may be deleted even though they contain no obvious zap token.
See also: other tokens tips and tricks.