When you have added a button to your trims, you can view the button parts.
To view button parts:
If the Materials tab is not already open, on the Resources tabs, click Materials.
In the Trims section, hover over the button image.Click the "X" icon to delete the button.
Click . A menu is displayed.
Click Look Inside to view the button parts. The button parts are displayed in a pop-up pane.In the image above, the button is a multi-colored 3D trim. When you look inside, you can see the different parts of the actual button 3D object.