problem : passing parameters between forms using shared library

Hello,

Here is my problem :

I have 2 forms A and B.

Form A and B have the same attached library 'LIB'.

I want to use shared library to pass parameters from Form A to Form B. My Library declare a variable MyVariable in the specif package.

Form A set a value to MyVariable.

Form A call Form B with the command :

open_form('B',

               NO_ACTIVATE,

               NO_SESSION,

               SHARE_LIBRARY_DATA);

Forms B has some triggers which fire at the call with this order : PRE-FORM, WHEN-NEW-BLOCK-INSTANCE, WHEN-NEW-RECORD-INSTANCE and WHEN-FORM-NAVIGATE.

In the 3 first trigger, If i try to read the value of Lib.MyVariable, it's ok, it's the value set by Form A.