void AddColumn(DataSnapshot data, int index)
{
ColumnModel column = TableModel.GetColumnCell(data);
column.SetReference(database.GetReferenceFromUrl(columnsRef.ToString()).Child(data.Key).Ref.ToString());
column.ColumnId = data.Key;
column.SetTypeChangeListener(this);
columns.Insert(index, column);
columnsEditView.AddView(column.GetEditView(this).GetView(), index);
}