The above screenshot shows how to add UXPageableComboBox into the custom editing form of UXScheduleView in WPF project.

Following snippet code shows how to implement this in xaml file.

<Intersoft:UXPage.Resources>
    ...
    <Style x:Key="EventDetailStyle" TargetType="Intersoft:UXScheduleViewEventDetail">
        ...
        <Setter Property="EditingFormTemplate">
            <Setter.Value>
                <DataTemplate>
                    <Intersoft:DockPanel FillChildMode="Custom" Margin="4,10,4,2"
                                            MinHeight="440" Width="380">
                        <Intersoft:UXTabControl Intersoft:DockPanel.IsFillElement="True"
                                                Style="{StaticResource Editing_TabStyle}"
                                                SelectedIndex="{Binding ActiveIndex, Mode=TwoWay}">
                            <Intersoft:UXTabItem BorderThickness="1,1,0,1"
                                                    CornerRadius="4,0,0,4" Header="General"
                                                    MinWidth="85">
                                <Intersoft:UXItemsControl Padding="6"
                                                            ItemContainerStyle="{StaticResource HeaderLabelStyle}" >
                                    <Intersoft:FieldLabel Header="Subject">
                                        <Intersoft:UXTextBox x:Name="DefaultFocus"
                                                                BorderBrush="{StaticResource InputBorder}"
                                                                Text="{Binding CurrentItem.Subject, Mode=TwoWay, ValidatesOnDataErrors=True}"/>
                                    </Intersoft:FieldLabel>
                                    <Intersoft:FieldLabel>
                                        <Intersoft:FieldLabel.Header>
                                            <TextBlock Text="Customer" FontWeight="Bold"/>
                                        </Intersoft:FieldLabel.Header>
                                        <Intersoft:UXPageableComboBox BorderBrush="{StaticResource InputBorder}" />
                                    ...

<Intersoft:UXScheduleView x:Name="SampleControl1"
                            EventDetailStyle="{StaticResource EventDetailStyle}"
                            ...>
    <Intersoft:UXScheduleDayView />
    <Intersoft:UXScheduleWorkWeekView />
    <Intersoft:UXScheduleWeekView IsActive="True"/>
    <Intersoft:UXScheduleMonthView />
</Intersoft:UXScheduleView>

Hope this helps.

Thank you for your response.

The problem was that I tried to set the HorizontalAlignment = "Left" in UXPageableComboBox.
When I removed this feature.

Everything works fine.

Once again, thank you very much for your help.

Glad to hear that the snippet code helps.

You may try to set Width property of UXPageableComboBox such as shown in the following snippet code.

<Intersoft:UXPageableComboBox BorderBrush="{StaticResource InputBorder}" HorizontalAlignment="Left" Width="180" />

Hope this helps.