Head-up Display : Hide Section Link only

Hi

In the Head-up display, we have list of links to the related information sections of the page. I am just wondering if there is a possibility of hiding one of the related information section only with an IF condition. like

if ID is Null

then HIDE the link.

The reason why i need this is , i have created a web applet which will display only If ID is NOT NULL. Even though the web applet is hidden but the link in the Head-up display is still showing. so just checking if there is a possibilty of hiding this link in Head-up display.