Gets a coeficient which will determine in each layout pass the size of the viewport. If zero is specified the size of the viewport will be equal to the scrollviewer viewport. If 0.5 is specified the size of the viewport will be enlarged to take up half screen more at both sides of the original viewport.

'Declaration
 
Public ReadOnly Property ViewportGap As System.Double

'Usage
 
Dim instance As C1ListViewerPanel
Dim value As System.Double
 
value = instance.ViewportGap

public System.double ViewportGap {get;}