Once you select an element in the Content Pane, you place (drag and drop) it into the Panel Configuration Pane. If the class instance is a panel, that panel is placed. If it is a tile, it is placed at the location on the panel it is dropped on.
For each Panel Builder catalog, rules exist to prevent illegal configurations. In the example below, a base panel has been placed and the user is attempting to place an illegal stacking panel above it. Panel Builder issues a Design Alert to prevent the illegal configuration.
The Configuration Pane can have underlying rules that prevent almost any illegal configuration:
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Rules that control the location, type, or number of tiles allowed on panel.
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Rules to prevent certain tiles in certain locations based on the type of stacking panel in the configuration.
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Rules that control the number or type of stacking frames.
In addition to the catalog specific rules exampled above, the Configuration Pane has some fundamental rules built into its user interface. Rules like tiles cannot overlap or extend beyond the top of the frame and stackers cannot be placed inside base frames are built-in.