User Story

As a developer, I want to add a custom button with a dropdown menu to provide a list of actions which users can execute from the spreadsheet toolbar.

Currently, a button with a custom action can be added, and a ZK menupopup can be opened in the action, but this doesn't provide display parity with the rest of the dropdowns in the toolbar

(no way to set the dropdown to appear under the button, not matching styles, etc)

Acceptance Criteria

Similar to how a button can be added in ToolbarButton button = ToolbarButton.Builder.create("buttonKey").build();

but which allows the button to hold a dropdown menu, with a number of items

Details

Ask Matt for POC