function LayersCreateFromFile(Filename : string = ''; idx: Integer = -1) : Integer;
Loads an image from a file and adds it as a new image layer
If Filename is '' then an open dialog is displayed (using ExecuteOpenDialog
) to allow the user to browse for an image to load for the layer.idx
specifies the insertion index for the layer, or -1 to append.
Returns the index of the new layer, or -1 in case of error.
// Prompt the user to select an image to load as a layer
// Load an image as a new layer
ImageEnView1.LayersCreateFromFile( 'C:\MyImage.jpg' );
// Which is the same as...
ImageEnView1.LayersAdd( 'C:\MyImage.jpg' );