(1) Created a windows form

(2) Added ultradockmanager with one dock area

(3) The form intially contains two panels with some controls

(4) panel1 and panel2 both added to the same dock area

(5) panel1 docks to left and panel 2 as well on unpinning

(6) Further panel2 is added to one more dock manager

(7) panel2 has two controls which could be floating/pinned/hide

(8) when panel2 controls were floating, panel2 was unpinned to left and

    panel1 was pinned to fill the whole form

(9) Now when tried to move the floating controls of panel2, exception of type null reference wass thrown

exception had come at Infragistics.Win.UltraWinDock.DragManager.UpdateDropPoint()