quote from BDS2006 Help Document...

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TTreeNode::StateIndex Property
...bla~
...bla~
...
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Valid index values are 1..15 only. Values of 0 or -1 mean no state icon.
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alex 님이 쓰신 글 :
: My code is like this, why i see the ImageIndex as well.
: Once i click the checkbox, I like to display only the StateImage 
:
: And also, if i use 
:   ht.Contains(htOnStateIcon)
: Never hit this.
: 
: ps. If i use ImageIndex instead of StateIndex, it shows the single icon but
: it's not reflect the change properly.
:
: __fastcall TForm1::TForm1(TComponent* Owner)
:     : TForm(Owner)
: {
:
:     AnsiString s;
:     TTreeNode *pNode = NULL;
:     TTreeNode *pAddToNode = NULL;
:     TTreeNode *pChildNode;
:     for ( int i = 0; i < 20; i++ )
:     {
:         s = AnsiString( "test node") + AnsiString(i);
:         pNode = tv->Items->AddObject( NULL,s.c_str() , (TObject *)0xffff );
:         pNode->StateIndex = 0;
:
:         pAddToNode = pNode;
:         for( int j=0;j<3 ;j++ )
:         {
:             pNode = tv->Items->AddChildObject( pAddToNode ,s.c_str() , (TObject *)0xffff );
:             pNode->StateIndex = 0;
:
:         }
:     }
: }
:
: void __fastcall TForm1::tvMouseDown(TObject *Sender, TMouseButton Button,
:       TShiftState Shift, int X, int Y)
: {
:   if ( Button == mbLeft )
:     {
:         TTreeNode *pNode   = ((TTreeView*)Sender)->GetNodeAt(X, Y);
:         if( pNode )
:         {
:
:             THitTests ht = tv->GetHitTestInfoAt( X, Y );
:             if ( ht.Contains(htOnStateIcon) || ht.Contains(htOnIcon))
:             {
:                 tv->Selected = pNode;
:                 if ( pNode->StateIndex == 0 || pNode->StateIndex == 2 )
:                     pNode->StateIndex = 1;
:                 else
:                     pNode->StateIndex = 2;
:             }
:         }
:     }
: }