Using Set_item_property default_where

I am trying to set the where property on a Block query using the
set_item_property.
When the  user enters  a letter I wan to show a list of names beginning with that letter. I know the syntax should be for example (last_name like  'M%').

WHen the user enters the letter all the user  gets is last_name the match the letter.
 
Please tell how to set the snytax for the set_item_property  default_where clause.

my current syntax is
set_item_property(Block_id,default_where, 'Last_name like :Block.last_name');
where :Block.last_name being the field where the user enters the letter.

timjshieldsAsked:
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RCorfmanCommented:
I'm not sure if this works or not, but can you use...
set_item_property(Block_id,default_where, 'Last_name like :Block.last_name || ''%'' ');
(note, it is two single quotes in a row '', not a double quote "
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timjshieldsAuthor Commented:
It worked perfectly. Thanks alot. Points to you
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