How to access the properties of splitter used in WinForms Docking Manager?

// Accessing DragSplitter
private void dockingManager1_DockStateChanged(object sender, Syncfusion.Windows.Forms.Tools.DockStateChangeEventArgs arg)
{
  foreach(DockControllerBase dcb in dockingManager1.DockAreaControllers)
  {
    if(dcb is DragSplitterController )
   {
       DragSplitterController dsc =(dcb as DragSplitterController);
       DragSplitter ds=(DragSplitter )dcb.HostControl;
       //We could change properties of ds as per the requirement
       ds.BackColor=Color.Green;
    }
  }
}

' Accessing DragSplitter
Private Sub DockingManager1_DockStateChanged(ByVal sender As Object, ByVal arg As Syncfusion.Windows.Forms.Tools.DockStateChangeEventArgs) Handles DockingManager1.DockStateChanged
Dim dcb As DockControllerBase
   For Each dcb In DockingManager1.DockAreaControllers
         If dcb.GetType() Is GetType(DragSplitterController) Then
             Dim dsc As DragSplitterController = CType(dcb, DragSplitterController)
             Dim ds As DragSplitter = CType(dcb.HostControl, DragSplitter)
             'We could change properties of ds as per the requirement
             ds.BackColor = Color.Green
         End If
   Next
End Sub