InfoPath Dev

I have a button event and a repeating table. I would like to hide the button until my field1 is not blank. I am not committed to code or rules, I just want to find the easiest way.

The button is not part of the repeating table, but it is a must it is disable or hidden until the user selects a value from the last row first field of the repeating table 

"/my:myFields/my:group1/my:group2[last()]/my:field1"

Sounds like you just need to add a formatting rule on the button like this:

   Condition: The expression /my:myFields/my:group1/my:group2[last()]/my:field1 = ''

   Formatting: Hide the button.

Damn it! I was just going to post the solution. You beat me to it. Thanks for the quick response,

Jimmy, you rock!