ModelForm + MultiValueField = form.save() problem

Hi!
I have a modelForm for some model. Example Article:

class Article(models.Model)
title = models.CharField(max_length=255)
price = models.IntegerField()
currency = models.IntegerField()

class ArticleForm(forms.ModelForm)
price = MyPriceFied(choices = CURRENCY_CHOICES)

class Meta:
model = Article
fields = ['title', 'price']

And i have a MyPriceField(forms.MiltiValueField) and
SinteticWidget(forms.MultiWidget)

class MyPriceField(forms.MultiValueField):
'''
Field witch contains with two widgets input and select.
Select's choices set in "choices" param.
'''
def __init__(self, choices = (), *args, **kwargs):
fields = (
forms.CharField(),
forms.ChoiceField(choices = choices),
)
widget_list = (
forms.TextInput(),
forms.Select(choices = choices),
)
self.widget = SinteticWidget(widgets = widget_list)
super(MyPriceField, self).__init__(fields, choices, *args,
**kwargs)

This work fine. In template for field price rendered two controls
input type text and select.
But i have problem with submiting form. I have no idea how can i
create instance of Article class by form.save().
Becouse in form i have one field but in model i have two.

Can somebody help me? Can some one advise algorithm that can be used
to implement this?
Maybe it's not really)))
Thanks

Sorry for my english)

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