I got some problems with synchronizing modeldata und view-data..

I have an EditableGrid with some ComboBox columns.
When a Comboboxes value is changed by the user it isnt propagated to the modelstore of the GridEditor.
It takes another edit in another ComboBox.
But then the following edit isnt propagated, and so forth.

What i do is:
I listen to changeSelection of each combobox, so get informed about changes.
This is when I want to get the 'value' of myGrid using myGrid.getStore().getModels() for further processing.
But this contains the old and not the new value.

What i need is some kind of updateModel- or synchronize- method in an EditableGrid.
Is there a way to do that?