3d0f7949_ents___Techniques_for_WCAG_2_0__LiveCycle_Placement_Rules
[Control Type] Button [LiveCycle Placement Rules] 
LiveCycle automatically places the label on the button; it does not have to be positioned manually. Ensure that the button's purpose is properly described in the label text.
PDF10: Providing labels for interactive form controls in PDF documents | Techniques for WCAG 2.0