How do identify buttoncolumn?

I have a button column like so:

<asp:ButtonColumn CommandName="Cancel" Text="Make Pending"></asp:ButtonColumn>

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I wanted to make this visible or not, row by row, based on some critieria, so I added an

<asp:ButtonColumn ID="btnMakePending" CommandName="Cancel" Text="Make Pending"></asp:ButtonColumn>

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In C#:

while (enumerator.MoveNext())
{
    int something = enumerator.Current;
    if (something  != 0)
    {
         btnMakePending.Visible = false;    
    }
}

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But it turns out the ID is not a property of ButtonColumn.
How do I do this?