Default image alignment within the viewer when the area of the viewer is smaller than the displayed document in its current zoom configuration.
Setting this property to DocumentAlignmentTopLeft has the effect to display the most top-left part of the displayed page during "Zoom In" operations.

public GdPicture14.ViewerDocumentAlignment DocumentAlignment {get; set;}

'Declaration
 
Public Property DocumentAlignment As GdPicture14.ViewerDocumentAlignment