Question

I would like to take the xaml I currently have for a ComboBox (below), and condense it into something like the Style also shown below. I think this should work, but I have a ‘Type’ing issue and not sure how to resolve it

"Cannot resolve the Style Property 'Margin'. Verify that the owning type is the Style's TargetType, or use Class.Property syntax to specify the Property.)

As I look at the existing ComboBoxStyle (also below) that I’m looking to base this new style off of, I see that I hadn’t used x:Type, but it does seem to work.

Is there any reason this new style shouldn’t work? What must I change?

Cheers,
Berryl

combo box, as is, working):

<ComboBox 
    x:Name="cboDepartmentFilter" Style="{StaticResource ComboBoxStyle}"
    Margin="{StaticResource FliterPanelItem_Margin}" Width="{StaticResource FilterPanelItem_Width}"
    ItemsSource="{Binding Path=DepartmentFilterControl.Choices}"                     
    ToolTip="{Binding DepartmentFilterControlData.ToolTipTitle}"                    
    />

what I want:

<ComboBox Style="{StaticResource FilterPanelComboBoxStyle}" DataContext="{Binding DepartmentFilterControl}"  />

<!- in some resource file ->
<Style x:Key="FilterPanelComboBoxStyle" BasedOn="{StaticResource ComboBoxStyle}">
    <Setter Property="Margin" Value="{StaticResource FliterPanelItem_Margin}" />
    <Setter Property="Width" Value="{StaticResource FilterPanelItem_Width}" />
    <Setter Property="ItemsSource" Value="{Binding Choices}" />
    <Setter Property="ToolTip" Value="{Binding ToolTipTitle}" />
</Style>

<!-- 

This style defines a common margin for items in a filter panel.
–>

150

existing ComboBoxStyle:

<!-- ComboBox Style -->
<Style x:Key="ComboBoxStyle" TargetType="ComboBox">
    <Setter Property="Background" Value="{StaticResource headerBrush}" />
    ...
    <Setter Property="Template">
        <Setter.Value>
        ...
        </Setter.Value>
    </Setter>

    <Setter Property="ItemContainerStyle" Value="{StaticResource ComboBoxItemStyle}" />
    <Setter Property="IsSynchronizedWithCurrentItem" Value="True" />

</Style>

Answer 1

You still need to specify the TargetType in the derived style. (Or you prefix the properties with "ComboBox.")