M41 Alpha Five v11 Setting session var on open component 1

When you define a button using Action Javascript to open a child Grid, Dialog, or Custom Component, you can also set session variables at the same time that the Ajax callback is made to open the child component. The session variables can be set to constant values, or to values returned by Javascript functions that you define. For example, you might read the value in a field in the parent Grid, then use that value to set a session variable (Requires build 3851 or above).