Resolve textbox background focus issue

Question

I have a simple problem, but I'm new to Silverlight.

I have a textbox, transparent, but when I got focus, textfield background will come white.

How to solve?

Answer 1

You just need to either edit the "FocusedState" in the VisualStateManager for the Default control template, or provide your own like the one provided below in either a Resource Dictionary or in your UserControl.Resources etc.

Here's how you would apply the Style Template Below to your TextBox Instance

<TextBox Style="{StaticResource YourCustomTextBoxStyle}/>

Here's a Default WP7 TextBox Style Template with the proper place Adjusted...

<Style x:Key="YourCustomTextBoxStyle" TargetType="TextBox">  
            <Setter Property="FontFamily" Value="{StaticResource PhoneFontFamilyNormal}"/>  
            <Setter Property="FontSize" Value="{StaticResource PhoneFontSizeMediumLarge}"/>  
            <Setter Property="Background" Value="{StaticResource PhoneTextBoxBrush}"/>  
            <Setter Property="Foreground" Value="{StaticResource PhoneTextBoxForegroundBrush}"/>  
            <Setter Property="BorderBrush" Value="{StaticResource PhoneTextBoxBrush}"/>  
            <Setter Property="SelectionBackground" Value="{StaticResource PhoneAccentBrush}"/>  
            <Setter Property="SelectionForeground" Value="{StaticResource PhoneTextBoxSelectionForegroundBrush}"/>  
            <Setter Property="BorderThickness" Value="{StaticResource PhoneBorderThickness}"/>  
            <Setter Property="Padding" Value="2"/>  
            <Setter Property="Template">  
                <Setter.Value> 
                    <ControlTemplate TargetType="TextBox">  
                        <Grid Background="Transparent">  
                            <VisualStateManager.VisualStateGroups> 
                                <VisualStateGroup x:Name="CommonStates">  
                                    <VisualState x:Name="Normal"/>  
                                    <VisualState x:Name="MouseOver"/>  
                                    <VisualState x:Name="Disabled">  
                                        <Storyboard> 
                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Visibility" Storyboard.TargetName="EnabledBorder">  
                                                <DiscreteObjectKeyFrame KeyTime="0">  
                                                    <DiscreteObjectKeyFrame.Value> 
                                                        <Visibility>Collapsed</Visibility> 
                                                    </DiscreteObjectKeyFrame.Value> 
                                                </DiscreteObjectKeyFrame> 
                                            </ObjectAnimationUsingKeyFrames> 
                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Visibility" Storyboard.TargetName="DisabledOrReadonlyBorder">  
                                                <DiscreteObjectKeyFrame KeyTime="0">  
                                                    <DiscreteObjectKeyFrame.Value> 
                                                        <Visibility>Visible</Visibility> 
                                                    </DiscreteObjectKeyFrame.Value> 
                                                </DiscreteObjectKeyFrame> 
                                            </ObjectAnimationUsingKeyFrames> 
                                        </Storyboard> 
                                    </VisualState> 
                                    <VisualState x:Name="ReadOnly">  
                                        <Storyboard> 
                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Visibility" Storyboard.TargetName="EnabledBorder">  
                                                <DiscreteObjectKeyFrame KeyTime="0">  
                                                    <DiscreteObjectKeyFrame.Value> 
                                                        <Visibility>Collapsed</Visibility> 
                                                    </DiscreteObjectKeyFrame.Value> 
                                                </DiscreteObjectKeyFrame> 
                                            </ObjectAnimationUsingKeyFrames> 
                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Visibility" Storyboard.TargetName="DisabledOrReadonlyBorder">  
                                                <DiscreteObjectKeyFrame KeyTime="0">  
                                                    <DiscreteObjectKeyFrame.Value> 
                                                        <Visibility>Visible</Visibility> 
                                                    </DiscreteObjectKeyFrame.Value> 
                                                </DiscreteObjectKeyFrame> 
                                            </ObjectAnimationUsingKeyFrames> 
                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Background" Storyboard.TargetName="DisabledOrReadonlyBorder">  
                                                <DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource PhoneTextBoxBrush}"/>  
                                            </ObjectAnimationUsingKeyFrames> 
                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="BorderBrush" Storyboard.TargetName="DisabledOrReadonlyBorder">  
                                                <DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource PhoneTextBoxBrush}"/>  
                                            </ObjectAnimationUsingKeyFrames> 
                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Foreground" Storyboard.TargetName="DisabledOrReadonlyContent">  
                                                <DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource PhoneTextBoxReadOnlyBrush}"/>  
                                            </ObjectAnimationUsingKeyFrames> 
                                        </Storyboard> 
                                    </VisualState> 
                                </VisualStateGroup> 
                                <VisualStateGroup x:Name="FocusStates">  
                                    <VisualState x:Name="Focused"/>  <!-- *** Right here is your culprit, I just ripped out the FocusedState Storyboard so it doesnt do anything when focused. *** -->

                                    <VisualState x:Name="Unfocused"/>  
                                </VisualStateGroup> 
                            </VisualStateManager.VisualStateGroups> 
                            <Border x:Name="EnabledBorder" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" Margin="{StaticResource PhoneTouchTargetOverhang}">  
                                <ContentControl x:Name="ContentElement" BorderThickness="0" HorizontalContentAlignment="Stretch" Margin="{StaticResource PhoneTextBoxInnerMargin}" Padding="{TemplateBinding Padding}" VerticalContentAlignment="Stretch"/>  
                            </Border> 
                            <Border x:Name="DisabledOrReadonlyBorder" BorderBrush="{StaticResource PhoneDisabledBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="Transparent" Margin="{StaticResource PhoneTouchTargetOverhang}" Visibility="Collapsed">  
                                <TextBox x:Name="DisabledOrReadonlyContent" Background="Transparent" Foreground="{StaticResource PhoneDisabledBrush}" FontWeight="{TemplateBinding FontWeight}" FontStyle="{TemplateBinding FontStyle}" FontSize="{TemplateBinding FontSize}" FontFamily="{TemplateBinding FontFamily}" IsReadOnly="True" SelectionForeground="{TemplateBinding SelectionForeground}" SelectionBackground="{TemplateBinding SelectionBackground}" TextAlignment="{TemplateBinding TextAlignment}" TextWrapping="{TemplateBinding TextWrapping}" Text="{TemplateBinding Text}" Template="{StaticResource PhoneDisabledTextBoxTemplate}"/>  
                            </Border> 
                        </Grid> 
                    </ControlTemplate> 
                </Setter.Value> 
            </Setter> 
        </Style> 

You can also apply this same template to all your TextBox controls by default utilizing BasedOn Values.

There's other ways of doing this with less but this is a good place to begin learning the fundamentals. Hope it helps.