Focus Combobox when User Control is focused.

Question

I have a UserControl, which has one combobox and a button. I want to Shrink the Combobox when It has KeyBoard Focus. I got it working with textbox control.

Style is not working.

<UserControl x:Class="TextBoxStyle.WPFComboBox"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
GotFocus="UserControl_GotFocus" Focusable="True" >
<UserControl.Resources>
<Style x:Key="{x:Type ComboBox}" TargetType="ComboBox" >
<Style.Triggers>
<Trigger Property="IsKeyboardFocused" Value="True" >
<Setter Property="Margin" Value="0,0,25,0" />
</Trigger>
</Style.Triggers>
</Style>
</UserControl.Resources>
<StackPanel>
<Grid >
<Grid.RowDefinitions>
<RowDefinition/>
</Grid.RowDefinitions>
<Button HorizontalAlignment="Right" Background="Transparent" Click="btnExpression_Click" Name="btnExpression" BorderBrush="Transparent" Focusable="False" >
<Image Grid.Row="0" Source="/TextBoxStyle;component/Resources/folder_closed_16x16_XP.ico" SnapsToDevicePixels="True" Stretch="None" VerticalAlignment="Center" HorizontalAlignment="Center" Name="ebButton" />
</Button>
<ComboBox Grid.Row="0" Name="cmbBox" IsEditable="True" Focusable="True" PreviewTextInput="cmbBox_PreviewTextInput" SelectionChanged="cmbBox_SelectionChanged" >
<ComboBox.ToolTip>
<ToolTip x:Name="toolTip" />
</ComboBox.ToolTip>
</ComboBox>
</Grid>
</StackPanel>
</UserControl>

 <Style x:Key="{x:Type TextBox}" TargetType="{x:Type TextBoxBase}">



            <Style.Triggers>



                <Trigger Property="IsKeyboardFocused" Value="True">



                    <Setter Property="Margin" Value="0,0,20,0"/>



                </Trigger>                    



            </Style.Triggers>            



        </Style>

This style works for textbox.

Answer 1

Is there a reason why the style is commented? Remove the key from the style definition as well.

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Geert van Horrik - CatenaLogic
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Answer 2

I forgot to take out the comment before posting it. I have also tried removing key but still no luck.

Answer 3

Any one?

Answer 4

Hi RonakPPatel,

When a ComboBox is editable, the value of its IsKeyboardFocused property is FALSE even when the ComboBox has the keyboard focus. In fact, it's the TextBox within the visual tree of the ComboBox that really gets focused. The ComboBox's IskeyboardFocusWithin property does return true in this case. So use IsKeyboardFocusWithin property in the style for the ComboBox instead. For example:

<Style TargetType="ComboBox" >
            <Style.Triggers>
                <Trigger Property="IsKeyboardFocusWithin" Value="True" >
                    <Setter Property="Margin" Value="0,0,25,0" />
                </Trigger>
            </Style.Triggers>
</Style>

Sincerely,
Linda Liu

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