The 'visible' property

Boolean scalar, or integer for Window, Dialog or Form

Valid for: All displayable objects, and Series

The visible property determines whether an object is shown on the screen or not. The default is 1, which means that it is visible (provided it is open, and its parent object if any is also visible and open). Setting this property to 0 will hide the object. For example:

      MyWin.visible←0               ⍝ Hide a window
      MyWin.Ln.visible←0            ⍝ Hide a control on a window

For a Window, Form or Dialog object, you can set the visible property to one of the following, for compatibility with other APL systems:

      Any negative value      Hide window
      0                       Hide window
      1                       Show window at its normal size
      2                       Show window, minimized (icon only)
      3                       Show window, maximized (full-screen)