You can customize the stock screens originally developed for the container client.
Stock screens show the stock screen icon in the upper left corner of the screen displayed in the display pane on the Screen Design page, and the screen appears gray instead of white, which indicates you cannot configure the screen. You can, however, configure some of the properties of the stock screens and add menu groups to the stock screens.
When you configure the stock screen properties, the configuration dialog box you see depends on the type of the property selected for configuration. For example, if you select a String type property, you will see a String configuration dialog.