/**
The derived class may implement this function to actually draw the item
with the given index on the provided DC. If function is not implemented,
the item text is simply drawn, as if the control was a normal combobox.
/**
The derived class may implement this function to actually draw the item
with the given index on the provided DC. If function is not implemented,
the item text is simply drawn, as if the control was a normal combobox.