Hi, english is not my first language and I hope that you can understand me. I'm inheriting sale order form view and added a boolean field using xpath to set its location. That field will affect other buttons styles if its value is true or false. 

For example, if "foo" == False, then I've to remove from view the button "bar" or hide it.

I've tried using some xpath statements like:

First image file...

Also some like:

Second image file...

This is one of worst editors in foros that I've never seen.