With normal APEX features "Create a button displayed among this region's items" it's not possible as I know because APEX creates automatically a doSubmit button.
Anyway one way to fix that is to create an own button:
First create your own button, for example on:
Next upload the new button image into the application workspace.
Home>Application Builder>Application 100>Shared Components>Images>Create>
Application: #Your application name#
Upload New Image: #Image path#
Notes: #Additional information to the picture#
Last step is to create an "Display as Text" page item with the following settings:
Template: No Label
Post Element Text:
// if image was set to
// "No Application Associated"
// then use #WORKSPACE_IMAGES#
alt="Set user settings"
title="Set user settings"
Info: If the button should be right behind an item then edit the option "Begin On
New Line" to "No".
And of course you can put the img-tag also into the "Post Element Text" of an already used APEX item.
At the end it should look similar to that: