Is it possible to change TreeView's background color, not node color?

Question

In advance, Thanks!!
Actually, I've made my own treeview in my project. and  I've changed my treeview node color as i want
I wonder whether or not to change treeview's background color, not node color in below class.
// in ~.fr
Class
  kMyTreeViewWidgetBoss,
  kTreeViewWidgetBoss,
     IID_ICONTROLVIEW,                    kMyTreeViewCtrlViewImpl,  
     IID_ITREEVIEWWIDGETMGR,      kMyTreeViewListBoxWidgetMgrImpl,
     IID_ITREEVIEWHIERARCHYADAPTER,  kMyTreeViewListBoxHierarchyAdapterImpl,
     IID_ISTRINGLISTDATA,                          kStringListDataImpl,
     IID_IOBSERVER,                                  kMyTreeViewCtrlBoxObserverImpl,
type MainTreeViewListBox(kViewRsrcType)       : TreeViewWidget    (ClassID = kMyTreeViewWidgetBoss)  {};
MainTreeViewListBox   //Tree view
           kMyTreeViewWithTextListWidgetID, kPMRsrcID_None, // WidgetId, RsrcId
           kBindAll,           // Frame binding
           Frame(-1, 26, 300, 276)  // Frame
           kTrue, kTrue,         // Visible, Enabled
           kTrue,       // EraseBeforeDraw
           kInterfacePaletteFill,   // InterfaceColor
           kHideRootNode,// | kDrawEndLine, // Options. Display root node
           kFalse,  // Use H Scroll bar
           kTrue,  // Use V scroll bar
           20,   // fVScrollButtonIncrement
           20,   // fVThumbScrollIncrement
           0,   // fHScrollButtonIncrement
           0,   // fHThumbScrollIncrement
           2,   // Items selectable, 0 = No Selection, 1 = Single Selection, 2 = Multiple Selection
           kFalse,  // Allow children from multiple parents to be selected
           kTrue,  // Allow discontiguous selection
            //The tree view is dynamically created. 
class MyTreeViewCtrlView : public PanelView
virtual void   Draw(IViewPort* viewPort, SysRgn updateRgn);
void MyTreeViewCtrlView::Draw( IViewPort*  viewPort, SysRgn  updateRgn )
   AGMGraphicsContext gc(viewPort, this, updateRgn);
  InterfacePtr<IGraphicsPort>  gPort(gc.GetViewPort(), UseDefaultIID()); // IID_IGRAPHICSPORT);
  ASSERT(gPort);
  gPort->gsave();
  PMRect frameOut      = GetFrame();
  frameOut.MoveTo(0, 0);
  COLORREF crBackColor    = RGB( 255, 0, 0 );
  gPort->setrgbcolor( GetRGBtoReal( GetRValue(crBackColor) ), GetRGBtoReal( GetGValue(crBackColor) ), GetRGBtoReal( GetBValue (crBackColor) ));
gPort->rectpath(frameOut);
gPort->fill();
gPort->grestore();
PanelView::Draw( viewPort, updateRgn );
In above case, there are errors in kMyTreeViewCtrlViewImple when Indesign is launching.
// Error Assert
XferObject- ReadWrite for impl kMyTreeViewCtrlViewImpl of iid IID_ICONTROLVIEW in class kMyTreeViewWidgetBoss read wrong amount in plugin kMyTreeViewWidgetBoss
but, in kMyTreeViewWidgetBoss ClassDescriptionTable, when remove this( IID_ICONTROLVIEW, kMyTreeViewCtrlViewImpl), that's ok. but I can't change background color. just interfacepalettefill color
Please help me!!

Answer 1

Here's a sample!
That's all.
#define GetRGBtoReal( X )   (double) X / (double) 255.f
COLORREF crBackColor    = RGB( 255, 0, 0 );
gPort->setrgbcolor( GetRGBtoReal( GetRValue(crBackColor) ), GetRGBtoReal( GetGValue(crBackColor) ), GetRGBtoReal( GetBValue(crBackColor) ));