HI Andrei,
Thanks for your reply. Actually i have already done same way as you mentioned. I have achieved this requirement, i can able to make the field editable when view is in display mode. I created a custom tag for "chtmlb" and created a custom class with super class cl_chtmlb_config. Copied the class CL_CHTMLB_CONFIG_UTILITY to a custom class and redefined the method create_ui_element method there i cleared the lv_force_disabled and lv_display_mode variables for the particular attribute which i want to make editable.