Hey Alex,

Thank you for that example.  Annoyingly, it works fine...  From your example, I think it will be easier to see where we're going wrong.

Thanks again,

Rob

Hello Rob,

I followed your steps and created the following sample. I was not able to reproduce this when testing against latest service release for 10.1 on Windows 7. Please run the attached project and let me know if you can reproduce this. I even used the template you provided and still the issue was not reproducible. Have you tried setting the Min/MaxDropDownHeight properties of the XamComboEditor?

It's just the drop-down height (the height of the editor itself is fine and the elements within it have all been given a padding of zero as we've found that when populated to an enum, they tend to gain a little height when compared to non-populated editors).

<Style x:Key="EnumItemTemplate">
                <Setter Property="ComboBox.ItemTemplate">
                    <Setter.Value>
                        <DataTemplate>
                            <TextBlock Text="{Binding}" Padding="0"/>
                        </DataTemplate>
                    </Setter.Value>
                </Setter>
            </Style>

<Editors:XamComboEditor x:Name="rulesEnum"
                                            Width="110"
                                            Value="{Binding RulesEnum, ValidatesOnDataErrors=True}"
                                            ItemsSource="{Binding Path=ValidRules}"
                                            ComboBoxStyle="{StaticResource EnumItemTemplate}">
                    </Editors:XamComboEditor>

(Pardon the fomatting on the above, it wouldn't paste very nicely as markup!)

The scenario can be replicated (at least on our side) with two drop-down controls with exactly the same styling and performing the following steps.  Note that the values of the second drop-down depend on the value selected from the first:

1. Go to the "rulesEnum" drop-down and check that it is populated with nothing.  The size of the drop-down is roughly 40px at the point.
2. Select an item from the first drop-down which populates the rulesEnum drop-down.
3. Go back to the rulesEnum drop-down and observe the height.  By this point, its height is now zero.

I hope this sheds a little more light.

Many thanks,

Rob