Change means

ParentRow

                    TextColumn           CustomComboBoxColumn

Row1                TestX                              SelectedItem_X

Row2                TestY                              SelectedItem_Y

After collapsing and re-expanding

ParentRow

                    TextColumn           CustomComboBoxColumn

Row1                TestX                              SelectedItem_Y

Row2                TestY                              SelectedItem_X

It works now! Thank you! The problem was, that i created my own binding and didn't used the original cellBinding.

Last question:

How can i bind the itemssource without setting it programmatically in the code behind. If bind in ResolveDisplayElement, the list is filled but the binding to the selected item doesn't work.

Hi, 

Since a column isn't a FrameworkElement, you can't use a binding with and rely on DataContext inheritance or ElementName bindings, however you can use StaticResource as your Source. 

<ig;ComboBoxColumn ItemsSource={Binding Source={StaticResource yourCollection}, Path=yourItemsPropertyName}/>

-SteveZ

Thanks!

What should  i do, if i have a list within a list within a list. How to bind that?

I need help, asap!

Bye

Hi,

Do we have a resolution to bind the ItemSource of the Combobox column to a child list/property of the view model? I am trying to use a Combbox column in a similar scenario.

Thanks,

Deepa

One thing is a bit ugly about the solution.

If you catch the event for the selection changing in the comboboxes it will be called several times with partly "wrong" data.

it works finally, thank you very much!

Hi, 

Ok, so comboBox and listBox can a bit of a pain to bind to in a recycling scenario, b/c SelectedItem and ItemSource are tied together. 

So, when you kill the DataContext for a row, which is expected b/c it's being recycled, the binding says, that the SelectedItem must not be valid anymore, and sets it to null. 

So.. with that said, you'll have to move some code around. 

First store off the cell binding in ResolveDisplayElement:

 _cellBinding = cellBinding;

Then move all your SetBinding logic to AdjustDisplayElement, like so:

public override void AdjustDisplayElement(Cell cell)

        {

            ComboBoxColumn column = (ComboBoxColumn)cell.Column;

            this._combobox.ClearValue(ComboBox.SelectedItemProperty);

            Binding b = new Binding();

            b.Source = cell.Row.Data;

            b.Path = new PropertyPath(column.ItemSourceMemberPath);

            this._combobox.SetBinding(ComboBox.ItemsSourceProperty, b);

            this._combobox.SetBinding(ComboBox.SelectedItemProperty, _cellBinding);

            base.AdjustDisplayElement(cell);

        }

Now, everything should work as expected. 

-SteveZ

I think the problem is, that the underlying content of a row is cleared after it is collapsed. Thats the reason why null is stored to SelectedEquipment. Therefore it is empty after expanding again. Is it possible to keep the content of the row?