Complete hidden fields

[jose.hello]

Hello,

My SmartGWT version is 3.0 (power version), I use IE6.

I Have a user from that is binding with a datasource.

<field name="LASTNAME" type="text" length="150" title="Last Name"/>
        <field name="FIRSTNAME" type="text" length="90" title="First Name"/>
        <field name="FIRME_UID" type="text" length="90" title="FIRME UID" primaryKey="true"/>
        <field name="DISPLAYNAME" type="text" length="240" title="Display Name" detail="true"/>
        <field name="USER_ID" type="text" length="90" hidden="true"/>
        <field name="PASSWORD" type="text" length="90" hidden="true"/>
....

private class UserForm extends DynamicForm {
		public UserForm() {
			this.setPadding(5);
			this.setDataSource(userDataSource);
			this.setShowDetailFields(true);
			this.setNumCols(4);

		}
}

.....

As you see in my datasource, the password and the USER_ID are hidden.
You don't see these items in the user form.

Now, I want to save my data in database.

I do this:

					userDetailForm.saveData(new DSCallback() {
						public void execute(DSResponse response, Object rawData, DSRequest request) {
							SC.say("Modifications saved...");
						}
					});

But I want that USER_ID is filled with this value <FIRSTNAME>.<LASTNAME>
and fill PASSWORD with a String.

I have try to modifiy the datasource, setField ... But we do a userDetailForm.saveData so the datasource must be filled with userDetailForm and we shouldn't add a password and userId field in the From.
Any idea ?

Thanks.