DataGridView with ComboBox events [Solved]

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C#

C#4.0

DataGridView

Greetings fellow QA answerers, time for a question from one of your own.

I will explain what I'm doing first. I have a DataGridView control that is legacy, has to remain this type. It contains 3 columns, 2 of which is a ComboBox. When the first column changes to a type, the datasource for the second column should be populated with 2 values. When it is anything except this type, the dataset should be wiped so it cannot be accessed (kind of a way to disable the combobox).

I get the event for when the selected index of the first column's combo box is changed with this:

private void dbPlatform_EditingControlShowing(object _sender,
    DataGridViewEditingControlShowingEventArgs e)
{
    DataGridView dgv = _sender as DataGridView;

    ComboBox cb = e.Control as ComboBox;
    if (cb != null)
    {
        int row = dgv.CurrentCell.RowIndex;
        int column = dgv.CurrentCell.ColumnIndex;

        if (column == 0)
        {
            cb.SelectedIndexChanged -= (sender, args) => cb_SelectedIndexChanged(sender, row, column);
            cb.SelectedIndexChanged += (sender, args) => cb_SelectedIndexChanged(sender, row, column);
        }
    }
}

I really only need this to fire for the row that contains the combobox thats index is being changed. The problem is, lets say I have row 4 column 1 change, this gets called for each row.

ADDED:
I should clarify the big issue. I can't find a way to get the row number or row index of the combobox cell that fires this event. I can cast the _sender as a ComboBox, or a DataGridView, but not a DataGridViewComboBoxCell which would contain the data I need (row index).