How to loop through records in the block

Hello,
I have 2 blocks one emp_control_block and the other one based on the emp. The emp control block basically has some search critieria which is then passed onto the emp block to execute the query. However, I don't want to show any emp block data until the user presses the search button in the control block then I automatically want to make visible the EMP block and also set the width of columns. Right now, in the properties I have not assigned any Canvas to the EMP Block
Can anyone tell me How do I loop through the block and show the items/columns in a canvas that I have already created. Any example of the code would be really appreciated. Thanks

Monica,
I tried your code but I get NO NAVIGABLE ITEMS IN DESTINATION BLOCK error. In the property palette for the items in the EMP block I have assigned Null as Canvas because I want to programatically assign it to the emp_stack_canvas. How do I do that? Also I want to change the item width for each column to say a fixed width of 50.
Thanks

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