Missing function - TrueWindow

General
3

This should do it:

Public Function GlobalLeft(extends r as DesktopUIControl) As Double
  // For the control referenced, figure out the Global left by walking up the containment hierarchy.
  Dim retValue As Double = r.Window.Left + r.Left  
  
  Dim p As Object = r.Parent
  
  Dim container as DesktopContainer
  
  While p <> r.Window
    if p isa DesktopUIControl then
      p = DesktopUIControl( p ).Parent
    elseif p isa DesktopContainer then
      container = DesktopContainer( p )
      retValue = retValue + container.Left
      p = container.Parent
    end if
  Wend
  
  Return retValue
End Function

EDIT: Fixed an incorrect assumption.