You can change the order in which the ad parts are displayed using the Arrange button. This enables you to either increase or decrease the Z index of the ad parts by bringing the part forward or sending it to the back.

To rearrange the ad parts:

1. From the Positioning Ad window, on the toolbar select Arrange.
2. To move the ad part to the back, select Send to Back.
3. To move the ad part forward, select Bring to Front.
4. Click Save.