The Favorites Toolbar on the left side is vertically divided into three subcontainers:

If you want to add fixed buttons to the Favorites Toolbar (that is, buttons that can not be modified or removed by the user), you need to add them to either the top or the bottom section of the Favorites Toolbar.

The main BlueprintFormsStudioPlugin.mxml file shows how you can easily use the AddItemsPlugin to add your own buttons to the top and bottom sections of the toolbar, respectively:

<editor:FavoritesToolbar>
  <editor:plugins>
     <ui:AddItemsPlugin>
       <ui:items>
         ...add your component/button here...
       </ui:items>
       <ui:after>
         <Component itemId="{favoritesToolbar.NEW_MENU_BUTTON_ITEM_ID}"/>
       </ui:after>
     </ui:AddItemsPlugin>
  </editor:plugins>
</editor:FavoritesToolbar>

Ensuring a proper order of the items of the favorites toolbar helps significantly in making the application usable. Note how an after constraint is used to put the new button to a specific place. It uses the framework-predefined itemId of the Library button to describe the desired location of the added button, and references the new button via an element with Blueprint namespace - the button itself is declared in a separate MXML file in the Studio plugin.

To add a simple button with an action, enter the following code inside the <items> element (see Section 7.2, “Localizing Labels” to learn how to localize the label of the button):

<Button itemId="exampleButton">
  <baseAction>
    <editor:ShowCollectionViewAction text="toBePublished"
     published="false" editedByMe="true" contentType="CMArticle"/>
  </baseAction>
</Button>

This code snippet will create a search folder button with label text "toBePublished" that uses a ShowCollectionViewAction to open the Library window in a mode that searches for a restricted set of content items (please see the API documentation for ShowCollectionViewAction for more details).