Oracle Forms

I have a window that contains one canvas and two blocks. These block contains buttons, text items and display items. The window is basically a calendar pop-up that allows the user to select a date from a calendar. There are no db items at all.

I want this window/canvas to only be shown when the user clicks a button. The problem that I am having is that we have a toolbar with a "Next" button that uses "next_block" to show the next block, when this button is clicked the calendar shows up.

I have made all the settings necessary to make the block non-enterable but the next_block built-in still shows the calendar. Is there a way to exclude the calendar from block-level navigation?

Thanks!