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I have created a table in  LiveCycle using a dropdown box with options to select "1", "2", or "3".   The problem I am having is when I open the PDF from the user's  perspective... Once I select any of the available options, I can't clear  them out of the box.  This is a problem if the user accidentally  selected something, but really needs to leave the space blank.  Delete  and backspace won't work, and I'm basically stuck with a value once one  has been selected.

How can I make it so that users can  delete the selected value to make it a blank cell again?  I am a  beginner at LiveCycle and FormCalc, so a step-by-step answer would be  most greatly appreciated!  Thanks!