Background Layer Manager

Note: When multiple background layers are overlaid, priority is given to the one that appears highest in the list. In other words, a layer in the first list position is drawn "on top of" all other layers, since they are all below it on the list.

The Background Layer manager lets you add, edit, and remove and manage the background layers that are associated with the model. The dialog box contains a list pane that displays each of the layers currently contained within the model, along with a number of button controls.

When a background layer is added, it appears in the Background Layers list pane, along with an associated check box that is used to control that layer’s visibility. Selecting the check box next to a layer causes that layer to become visible in the main drawing pane; clearing it causes it to become invisible. If the layers in the list pane are contained within one or more folders, clearing the check box next to a folder causes all of the layers within that folder to become invisible.

The toolbar consists of the following buttons:


	New	Opens a submenu containing the following commands: File —Opens a browse dialog box that allows you to choose the file to use as a background layer. Folder —Creates a folder in the Background Layers list pane.
	Delete	Removes the currently highlighted background layer.
	Rename	Lets you rename the currently highlighted layer.
	Edit	Opens the background layer properties dialog box that corresponds with the currently highlighted background layer.
	Shift Up	Moves the currently highlighted object up in the list pane.
	Shift Down	Moves the currently highlighted object down in the list pane.
	Expand All	Expands all of the branches in the hierarchy displayed in the list pane.
	Collapse All	Collapses all of the branches in the hierarchy displayed in the list pane.
	Help	Displays online help for the Background Layer Manager.