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When I call CExtTreeGridWnd::ItemGetFirstChild() at item which contains no children, it asserts in
CExtTreeGridCellNode::TreeNodeGetChildAt( ULONG nPos ) at line
ASSERT( nPos < ULONG(m_arrChildren.GetSize()) );
Shouldn’t it return NULL instead?

ok. in the demo , function CChildView::OnUpdateTreeDeleteFocusedChildren()....
replace ItemGetChildCount() like this :

void CChildView::OnUpdateTreeDeleteFocusedChildren(CCmdUI* pCmdUI)
{
HTREEITEM htiFocus = ItemFocusGet();
if(        htiFocus == NULL
        ||    ItemGetFirstChild( htiFocus ) == NULL
//        ||    ItemGetChildCount( htiFocus ) == 0
        )


then focus last child and it will assert

We confirm this issue. To fix it, please update the source code for the CExtTreeGridCellNode::TreeNodeGetChildAt() method in ../Src/ExtTreeGridWnd.cpp:

CExtTreeGridCellNode * CExtTreeGridCellNode::TreeNodeGetChildAt( ULONG nPos )
{
      ASSERT_VALID( this );
      if( m_arrChildren.GetSize() == 0 )
            return NULL;
      ASSERT( nPos < ULONG(m_arrChildren.GetSize()) );
CExtTreeGridCellNode * pNode = m_arrChildren.GetAt( nPos );
      ASSERT_VALID( pNode );
      ASSERT( pNode->m_nOptIndex == nPos );
      return pNode;
}

I’ve tried the last 2.63.4 code and the bug is still there.

In this case we would like to ask you to help us reproduce the problem. Would you modify this test project to reproduce this assertion failure?

Thank you for reporting the bug. It is fixed in the latest code (2.63.4) available from our ftp site.