I have a form view which it has a tree view like this:

<form>

<header>

<button name="btn_validate">

<header>

<notebook>

<page>

<field name="o2m">

<tree>

<field name="field_one">

<field name="field_two">

<field name="field_three">

</tree>

</field>

</page>

</notebook>

</form>

the tree display more than 20 records that's why I have to freeze the column name to avoid hassle like we need to scroll up again to know which column does the data belong(if there's to many column display)

 Everytime  I scroll down the headers disappear ,How can I achieve this?

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