Ho to show/hide buttons and table controllers based on conditions set in the groovy script in SAP Advanced Workflow

Question

I'm using the following code in my groovy script to hide or show a button and a table controller in the form. But this is not working and not making any difference in the show/hide of the screen elements. This script is called on a button click in SAP advanced workflow form.

form.getButton(<button_name>).hide()
form.getWidget(<table_controller_name>).hide() 

and

form.getButton(<button_name>).show()
form.getWidget(<table_controller_name>).show() 

If someone can hep me in finding where I'm missing something then it will be greatly appreciated.