Sets the width of the top margin around the background image of a page.
Related Variables: DispMgrBMPMarginBottom | DispMgrBMPMarginLeft |DispMgrBMPMarginLeftDispMgrBMPMarginRight |DispMgrBMPMarginsWin
Section: System
Default: DispMgrBMPMarginTop = 0
*No restart required (Settings.Dynamic property)
