Hello,

We’re using a XamComboEditor in .NET advantage 13.1 and are upgrading to Ultimate 15.1.

The ComboEditor crashes our application after this upgrade.

We used to have a custom filter in our ComboEditor:

    <editors:XamComboEditor x:Name="comboEditor" AutoComplete="False" AllowFiltering="True"

                                            Style="{StaticResource OurStyle}"

                                           Width="180" Height="25" MaxHeight="25" MinHeight="25" Margin="15,0,0,0"

                                           ItemsSource="{Binding OutItems}"

                                           DisplayMemberPath="Name"

                                            SelectedItem="{Binding SelectedItem}" >

                                        <editors:XamComboEditor.ItemTemplate>

                                            <DataTemplate>

                                                <StackPanel Orientation="Horizontal" >

                                                    <TextBlock Text="{Binding Path=Name}" Margin="5" Foreground="{DynamicResource OurForeground}"/>

                                                </StackPanel>

                                            </DataTemplate>

                                        </editors:XamComboEditor.ItemTemplate>

                                        <editors:XamComboEditor.CustomItemsFilter>

                                            <editors:ItemsFilter>

                                                <editors:ItemsFilter.Conditions>

                                                    <infragistics:ComparisonCondition Operator="Contains" />

                                                </editors:ItemsFilter.Conditions>

                                            </editors:ItemsFilter>

                                        </editors:XamComboEditor.CustomItemsFilter>

                                    </editors:XamComboEditor>

This control does not compile in 15.1. because of the “CustomItemFilter” object.

I changed the CustomItemFilter to ItemFilters and here’s the new ComboEditor:

    <editors:XamComboEditor x:Name="comboEditor" AutoComplete="False" AllowFiltering="True"

                                            Style="{StaticResource OurStyle}"

                                           Width="180" Height="25" MaxHeight="25" MinHeight="25" Margin="15,0,0,0"

                                           ItemsSource="{Binding OutItems}"

                                           DisplayMemberPath="Name"

                                            SelectedItem="{Binding SelectedItem}" >

                                        <editors:XamComboEditor.ItemTemplate>

                                            <DataTemplate>

                                                <StackPanel Orientation="Horizontal" >

                                                    <TextBlock Text="{Binding Path=Name}" Margin="5" Foreground="{DynamicResource OurForeground}"/>

                                                </StackPanel>

                                            </DataTemplate>

                                        </editors:XamComboEditor.ItemTemplate>

                                        <editors:XamComboEditor.ItemFilters>

                                            <editors:ComboItemFilter>

                                                <editors:ComboItemFilter.Conditions>

                                                    <infragistics:ComparisonCondition Operator="Contains" />

                                                </editors:ComboItemFilter.Conditions>

                                            </editors:ComboItemFilter>

                                        </editors:XamComboEditor.ItemFilters>

                                </editors:XamComboEditor>

That’s working, but our style is now causing runtime errors.

I get a NullReferenceException with the following stack (Will provide the complete stack if needed)

on. System.NullReferenceException: Object reference not set to an instance of an object.

   at Infragistics.Controls.Editors.ComboEditorBase`2.UpdatePositionStates()

   at Infragistics.Controls.Editors.Primitives.ItemsPanelBase`2.MeasureOverride(Size availableSize)

   at System.Windows.FrameworkElement.MeasureCore(Size availableSize)

   at System.Windows.UIElement.Measure(Size availableSize)

The source of the exception seems to be our MouseOver Visualstate (can provide the entire style if needed):

                                <VisualState x:Name="MouseOver">

                                    <Storyboard>

                                       <ObjectAnimationUsingKeyFrames Storyboard.TargetName="Bd" Storyboard.TargetProperty="Fill">

                                            <DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource ComboEditorItemHoverBackgroundFillBrush}"/>

                                        </ObjectAnimationUsingKeyFrames>

                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetName="Bd" Storyboard.TargetProperty="Stroke">

                                            <DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource ComboEditorItemHoverBackgroundFillBrush}"/>

                                        </ObjectAnimationUsingKeyFrames>

                                    </Storyboard>

                                </VisualState>

Is the change to the XAML object correct? Is there another object tag which is correct ?

If my change is correct, what may be causing the crash ?

Thanks.