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First and foremost, I apologize for my grammatical errors; my first language is Persian (Iran).
I have a button that I changed its appearance and I wanting to change color of lines that is inside it with Color Animation.but this error was displaying: "'LineA' name cannot be found in the name scope of 'Libraries.SettingsWindow'"

What I have tried:

XAML
<Window.Resources>
    <Style x:Key="CustomButtonStyle" TargetType="{x:Type Button}">
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type Button}">
                        <Border x:Name="Border" Cursor="Hand" BorderBrush="DarkGray" BorderThickness="0.5" CornerRadius="9" Background="WhiteSmoke">
                            <StackPanel Margin="0,0,0,0" Height="24" Width="24">
                                <Line x:Name="LineA" Stroke="Green" StrokeThickness="2" StrokeStartLineCap="Round" StrokeEndLineCap="Round" X1="4" X2="20" Y1="9" Y2="9"/>
                                <Line x:Name="LineB" Stroke="White" StrokeThickness="2" StrokeStartLineCap="Round" StrokeEndLineCap="Round" X1="4" X2="20" Y1="2" Y2="2"/>
                                <Line x:Name="LineC" Stroke="Red" StrokeThickness="2" StrokeStartLineCap="Round" StrokeEndLineCap="Round" X1="4" X2="20" Y1="2" Y2="2"/>
                            </StackPanel>
                        </Border>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
            <Storyboard x:Key="CustomButtonLineAIsCheckedTrue">
            <ColorAnimation From="{x:Null}" To="Green" Duration="00:00:01" Storyboard.TargetName="LineA" SpeedRatio="4" AutoReverse="False"/>
        </Storyboard>
        <Storyboard x:Key="CustomButtonLineAIsCheckedFalse">
            <ColorAnimation From="Green" To="{x:Null}" Duration="00:00:01" Storyboard.TargetName="LineA" SpeedRatio="4" AutoReverse="False"/>
        </Storyboard>
        <Storyboard x:Key="CustomButtonLineBIsCheckedTrue">
            <ColorAnimation From="{x:Null}" To="White" Duration="00:00:01" Storyboard.TargetName="LineB" SpeedRatio="4" AutoReverse="False"/>
        </Storyboard>
        <Storyboard x:Key="CustomButtonLineBIsCheckedFalse">
            <ColorAnimation From="White" To="{x:Null}" Duration="00:00:01" Storyboard.TargetName="LineB" SpeedRatio="4" AutoReverse="False"/>
        </Storyboard>
        <Storyboard x:Key="CustomButtonLineCIsCheckedTrue">
            <ColorAnimation From="{x:Null}" To="Red" Duration="00:00:01" Storyboard.TargetName="LineC" SpeedRatio="4" AutoReverse="False"/>
        </Storyboard>
        <Storyboard x:Key="CustomButtonLineCIsCheckedFalse">
            <ColorAnimation From="Red" To="{x:Null}" Duration="00:00:01" Storyboard.TargetName="LineC" SpeedRatio="4" AutoReverse="False"/>
        </Storyboard>
    </Window.Resources>
    <Grid>
    <Grid.Children>
                <Border x:Name="AutomaticSystemCalendar_CustomBorder" PreviewMouseLeftButtonDown="AutomaticSystemCalendar_CustomBorder_PreviewMouseLeftButtonDown" Cursor="Hand" CornerRadius="9" BorderBrush="DarkGray" BorderThickness="0.5" Margin="369,371,0,0" Height="24" Width="72" HorizontalAlignment="Left" VerticalAlignment="Top">
                <Border.Background>
                    <LinearGradientBrush EndPoint="0,1" StartPoint="0,0">
                        <GradientStop Color="#858d68" Offset="0"/>
                        <GradientStop Color="#cbd3ae" Offset="0.5"/>
                        <GradientStop Color="#e9f1cc" Offset="1"/>
                    </LinearGradientBrush>
                </Border.Background>
                <Button x:Name="AutomaticSystemCalendar_CustomButton" Style="{StaticResource CustomButtonStyle}" Margin="0,0,0,-1" HorizontalAlignment="Left" VerticalAlignment="Top" Height="24" Width="24">
                    <Button.Effect>
                        <BlurEffect Radius="0"/>
                    </Button.Effect>
                </Button>
            </Border>
        </Grid.Children>
    </Grid>

Code behind
C#
bool CustomButtonIsChecked = true;
    private void AutomaticSystemCalendar_CustomBorder_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
    {
        switch (CustomButtonIsChecked)
        {
            case true:
                (Resources["CustomButtonIsCheckedFalse"] as Storyboard).Begin();
                (Resources["CustomButtonLineAIsCheckedFalse"] as Storyboard).Begin();
                (Resources["CustomButtonLineBIsCheckedFalse"] as Storyboard).Begin();
                (Resources["CustomButtonLineCIsCheckedFalse"] as Storyboard).Begin();
                CustomButtonIsChecked = false;
                break;
            case false:
                (Resources["CustomButtonIsCheckedTrue"] as Storyboard).Begin();
                (Resources["CustomButtonLineAIsCheckedTrue"] as Storyboard).Begin();
                (Resources["CustomButtonLineBIsCheckedTrue"] as Storyboard).Begin();
                (Resources["CustomButtonLineCIsCheckedTrue"] as Storyboard).Begin();
                CustomButtonIsChecked = true;
                break;
        }
    }
Posted
Updated 5-Apr-22 7:33am
v5
Comments
[no name] 30-Apr-21 14:38pm    
You have (object time) architectural issues.

https://stackoverflow.com/questions/8126700/how-do-i-access-an-element-of-a-control-template-from-within-code-behind

https://docs.microsoft.com/en-us/dotnet/desktop/wpf/controls/how-to-create-apply-template?view=netdesktop-5.0

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