Performance problem when deleting items from grid

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   Hello,
in my application I noticed a performance problem when deleting a large number of elements from the grid via pItem->Remove();
Example:
First I create a large number of categories each holds two items:

CString sCatName;
g_pCustom = m_wndPropertyGrid.AddCategory(_T("Long Dialog"));
for(int i = 0; i < 512; ++i)
{
    sCatName.Format(_T("Category %03d"), i);
    CXTPPropertyGridItem* pCat = 
        g_pCustom->AddChildItem(new CXTPPropertyGridItemCategory(sCatName));
    pCat->AddChildItem(new CXTPPropertyGridItemNumber(_T("Element 1"), i));
    pCat->AddChildItem(new CXTPPropertyGridItemNumber(_T("Element 2"), i));
    pCat->Expand();
}
g_pCustom->Expand();

Then I delete 'Element 1' in every category using the following code:

if(g_pCustom)
{
    CXTPPropertyGridItems* pItems = g_pCustom->GetChilds();
    if(pItems)
    {
        int i = pItems->GetCount() - 1;
        while (i >= 0)
        {
            CXTPPropertyGridItem* pCategory = pItems->GetAt(i);
            if(pCategory)
            {
                CXTPPropertyGridItems* pElements = pCategory->GetChilds();
                if(pElements)
                {
                    CXTPPropertyGridItem* pElement1 = pElements->GetAt(0);
                    if(pElement1)
                    {
                        // here 'Element 1' will be deleted
                        pElement1->Remove();
                        pElement1 = 0;
                    }
                }
            }
            --i;
        }
    }
}

The removal of the elements takes more than a minute in release configuration on a 3 GHz computer running Win XP and ToolkitPro v9.81, whereas creation time is less than a second.
Is something wrong with my code or takes the remove-function so much time?
(I think the problem may be the call to m_pGrid->Refresh(); in the remove function.)
How can I speed up the removal?

Bye
   Holger