Adding button to row of buttons on top of app

Question

How to add a button to the top of the app?
 For example, how to add the "Take Ownership" button to the top of the Service Request (SR) app?

Answer

To add the Take Ownership button to the toolbar of the SR app, follow these steps.
Note that step #8 is not necessary for the Take Ownership button but may be necessary for other actions that do not appear in the left pane.

1) Go to -> System Configuration -> Platform Configuration -> System Properties

2) In Global Properties - filter by mxe.webclient.showOnToolbar

3) In Global Value - Add OWNERSHIP. OWNERSHIP is the action for "Take Ownership". Use the action for the button you wish to add.
For example, the value will be something like this:

INSERT,SAVE,CLEAR,PREVIOUS,NEXT,NAVHISTORY

Instead change it to this:

INSERT,SAVE,CLEAR,PREVIOUS,NEXT,NAVHISTORY,OWNERSHIP

That is, add OWNERSHIP. Where you add it does not make a difference in how it is displayed, so just add it to the end.

4) Save

5) Check the mxe.webclient.showOnToolbar and click on Live Refresh

6) Click OK

7) Go to -> Service Desk -> Service Request

8) The icon should appear in the toolbar. If it does not, then go to App Designer and select "Add Modify Toolbar Menu".
Add a new row with these values:

Element Type: OPTION
Key Value: OWNERSHIP
Position: (give it a number to determine where it shows relative to the over button's values)
Subposition: 0
Image: nav_icon_takeOwnership.gif
Visible: mark the checkbox
Access Key: CTRL+ALT+T
Tabs: All

Now #8 should already be set up for you. There should already be an
OWNERSHIP value but I am putting it here so you know all the steps
involved in making this button appear. Remove either the property or
the row, and the button will disappear.