Tooltip does not display

Hi,

I have 2 questions concerning tooltips in Zoho Creator:

1- I have added tooltips on some of my fields but they (the tooltips) do not display when I hover with the mouse on these same fields. Is there something specific I need to do in order to have the tolltips displayed?? Below is my form definition
form Scoring
{

column
{
must have UsernameInScoring
(
displayname = "Username"
type = picklist
values = User.Username
)

must have CopyNameInScoring
(
displayname = "Copy Name"
type = picklist
values = Copy.Copy_Name
)

V1
(
displayname = "1- Story Originality (0=Least Original, 5=Most Original)"
type = radiobuttons
values = {"0", "1", "2", "3", "4", "5"}
tooltip = "According to purchase message (\"buy my product\"), number of elements, timing, that bring something else (event, character, in the copy)."
)

V2
(
displayname = "2- Surprise Effect Global (0=least surprising, 5=most surprising)"
type = radiobuttons
values = {"0", "1", "3", "4", "5"}
tooltip = "Presence of a non-expected situation, behaviour or event, score the intensity of the surprise.\nPresence of a counter-stereotype."
)

}
column
{
Metascore1
(
type = formula
value = (V1.toLong() + V2.toLong())
)

}
}

2- What is the limit on number of characters in a tooltip? When I try to enter a relatively long tooltip in edit mode, Zoho Creator does not even accept it unless I shorten it to 5-6 lines.

Thanks in advance for your help