Background Mode setting in panel holders
Although a panel holder provides no color controls, the Background Mode setting in a panel holder affects the appearance of panels. These options are available:
- Opaque — Fields on the form behind the panel in the stacking order are not visible.
- Transparent — In a browser, fields on the form behind the panel holder in the stacking order are visible unless covered by a panel with a Background Color or Background Image set. This setting produces a "pane of glass" effect; the fields behind the panel are visible, but they cannot be accessed.
Panel holder Background Mode set to Transparent
(Click the image to expand it.) 
A panel holder's Background Mode also applies to any white space areas, which are portions of the panel holder unoccupied by a panel. This white space can include:
- The area created outside the panel borders when margins are set
- The area of the panel holder that has no panels
- The area below the last panel in a collapsible panel holder
- The area that appears when all the panels in a panel holder are collapsed
White space created by panel margins
(Click the image to expand it.)
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