How to type a tab in the Parameters sheet of the transformation properties page in Pentaho

Question

I am trying to create a transformation in Pentaho which should check if a file field delimiter (this is a character which separates the different fields in a file--in a csv file, for example, the delimiter is a ,) is a tab.

I have created a parameter called FieldDelimiter (in the properties section of my Pentaho transformation). Now, I want to specify the "Default Value" for this parameter to be a tab. However, when I hit the tab key, it doesn't actually insert a tab in the "Default Value" column (in fact, nothing gets inserted in the "Default Value" column). Is there any way I can insert a tab in this column?