The Shopping - tab has 4 different  modes of operation.
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Add    -        Yellow Title Bar
                                 where you add items to your shopping list.
Shop   -        Green Title Bar
                                 where shopping is done.
Cart    -         Red Title Bar
                                where you view items in your shopping cart.
Stock Cart - Blue Title Bar
                                 where you stock your items into Inventory.
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The top of the screen (under the tab selections) displays a title bar with 2 buttons on either end and a drop-down Spinner in the middle.  This bar changes colors based on the current shopping mode.
 
The Left and Right buttons change context based on the current shopping mode.  When in "Shop" mode, the left button displays "Add" and the right button displays "Cart".

 

The center button shows the current Shopping List selected.  Tapping the center button presents a drop-down list of the available Shopping Lists to appear.  From this dropdown list you can also add new shopping lists to the system.
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The "Add" button changes the current mode to "Add Mode" and allows you to add items to your shopping list.  The title bar will change color to Yellow.

 

The "Cart" button changes the current mode to "Cart Mode" and allows you to view the current shopping cart.  The Title bar will change color to Red.
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At the bottom of the screen are 2 spinners. 

 

An "Alpha" spinner on the left and a "Category" spinner on the right.
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The "Alpha" spinner allows you to filter your list by the first letter of the item.  This spinner also has a "Find" option that allows you to "Find" an item by inputing part of an items description to locate it.

 

Selecting the "A-Z" option resets the current list removing any "Alpha" filters.
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The "Category" spinner allows you to filter your list by the different categories within the list.
This spinner also includes a "Category" option that will sort your list by categories and display category headers above each category.
Selecting the "All" option resets the current list removing any "Category" filters.

 

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MENU Options
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"Scan" - scans items and automatically checks them off your list.

 

"Load List" - loads a previously saved list into the current shopping list.  To alter a previous list, simply load it into a blank list, make your changes and resave as the same name.

 

"Hide Checked/Show Checked" - toggles hiding or showing checked items.

 

"Clear List" - clears the current shopping list.

 

"Save List" - saves the current list for future use.

 

"More" - shows more menu options.

 

"Send List" - sends the current list to a Buddy.

 

"Import List" - imports a Buddy's shopping list.

 

"Check All" - checks all items in the current list.

 

"Uncheck All" - un-checks all items in the current list.

 

"Mobile Options" - presents the Mobile Options menu.

 

"Reprice List" - allows you to pick a store and then re-prices every item in the current list using the selected stores prices.

 

"Help" - shows this help.