numeric
Whether the panel is visible. Panels may be made to disappear and re-appear by changing this value.
Within table windows, individual sub-panels may be made invisible, e.g.
mywin.checks[4].visibility = 0
or by omitting the row/column index, all panels in the row/column may be made invisible, e.g.
mywin.checks.visibility = 0
If the panel is a window within a tab window, making it visible has the effect of programmatically selecting its tab button.
By default this value is 1 (visible).