This dialog box allows you to add or remove Background Terrains (see Background Terrains in Terrain Help for more information).
Add
Pressing this key will activate the standard Windows File Open dialog, allowing you to select a background Terrain file.
Remove
Will remove the currently selected background Terrain.
Properties
Pressing this key will activate the Background Display Properties dialog which allows you to control the display of backgrounds in either the Plan or Profile windows.
Display
The selected background file will be displayed in the Plan, Profile and 3D windows if this box is checked.
Shift Up/Shift Down
The display order of the backgrounds is controlled by the sequence of the Terrains in the list box. The Shift Up and Shift Down buttons move a file up or down in the list.
