List Column combo box dynamic read only at applet level

Hi Experts,

We have requirement to dynamically set the list applet cell read only from UI however, this field value is set through different fields. So, for this we implemented using DOM getElement and setAttribute readonly in the PM file.

This made the cell read only however, user when clicks on the combo box image of that cell, the list of drop down values are shown and thereby allowing user to modify.

Please suggest Open UI fix that may not require any SRF change.

Thanks in advance.

-Vin