Listbox.Clear .Add Methods

[Halsafar]

Much like in VB, I figured I would need to create some fancy listbox functions for C++.


Here is one I cannot seem to get to work properly.

//------------------
//Add an item to the list
//------------------
void ListBox::AddItem(char* Item)
{
    //add string
    SendMessage(m_hwnd, LB_ADDSTRING, 0, (LPARAM)Item);
    SendMessage(m_hwnd, LB_SETITEMDATA, m_IndexCount, (LPARAM)m_IndexCount);
    m_IndexCount++;
}


//------------------
//Clear the entire list
//------------------
void ListBox::Clear()
{
    LRESULT lRet;
    for (int Index = 0; Index < m_IndexCount+1; Index++)
    {
        lRet = SendMessage(m_hwnd, LB_DELETESTRING, Index,0);
    }

    m_IndexCount = 0;
} 

So I add a bunch of strings using the Add function, then I try and clear it all.

Well now and then it clears all but one, sometimes all but two depending on how many I add. If it clears all but 1 or 2, or more..then I can just keep pressing it and it gets rid of everything one at a time.

What is going on????