Table 226 – Field flags specific to button fields

Bit position

Name

Meaning

15

NoToggleToOff

(Radio buttons only) If set, exactly one radio button shall be selected at all times; selecting the currently selected button has no effect. If clear, clicking the selected button deselects it, leaving no button selected.

16

Radio

If set, the field is a set of radio buttons; if clear, the field is a check box. This flag may be set only if the Pushbutton flag is clear.

17

Pushbutton

If set, the field is a pushbutton that does not retain a permanent value.

26

RadiosInUnison

(PDF 1.5) If set, a group of radio buttons within a radio button field that use the same value for the on state will turn on and off in unison; that is if one is checked, they are all checked. If clear, the buttons are mutually exclusive (the same behavior as HTML radio buttons).