Select the location in the Project Explorer in which you want to add the button.
On the Insert ribbon, click the down-arrow under 
Button in the Add Navigation and Interaction group and select Transparent.
You can create a transparent button to add to project. Transparent buttons are useful for creating hotspots on regions of an image.
To create a transparent button:
Select the location in the Project Explorer in which you want to add the button.
On the Insert ribbon, click the down-arrow under Button in the Add Navigation and Interaction group and select Transparent.
The transparent button is added to the project. Move and size the button and use the Action ribbon to assign an action to the button.
See also: Assigning an action to a button
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