VRCMelonAssistant/VRCMelonAssistant/Styles/CheckBox.xaml

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <Style TargetType="CheckBox">
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="CheckBox">
                    <Grid
                        Name="templateRoot"
                        Background="{DynamicResource CheckboxDefaultOutlineColor}"
                        SnapsToDevicePixels="True">
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition Width="Auto" />
                            <ColumnDefinition Width="*" />
                        </Grid.ColumnDefinitions>
                        <Border
                            Name="checkBoxBorder"
                            Margin="1"
                            HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
                            VerticalAlignment="{TemplateBinding VerticalContentAlignment}"
                            Background="{DynamicResource CheckboxDefaultBackground}"
                            BorderBrush="{TemplateBinding BorderBrush}"
                            BorderThickness="0">
                            <Grid Name="markGrid">
                                <Path
                                    Name="optionMark"
                                    Margin="1"
                                    Data="F1 M9.97498,1.22334 L4.6983,9.09834 L4.52164,9.09834 L0,5.19331 L1.27664,3.52165 L4.255,6.08833 L8.33331,1.52588E-05 L9.97498,1.22334"
                                    Fill="{DynamicResource CheckboxTickColor}"
                                    Opacity="0"
                                    Stretch="None" />
                                <Rectangle
                                    Name="indeterminateMark"
                                    Margin="2"
                                    Fill="{DynamicResource CheckboxTickColor}"
                                    Opacity="0" />
                            </Grid>
                        </Border>
                        <ContentPresenter
                            Name="contentPresenter"
                            Grid.Column="1"
                            Margin="{TemplateBinding Padding}"
                            HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
                            VerticalAlignment="{TemplateBinding VerticalContentAlignment}"
                            Focusable="False"
                            RecognizesAccessKey="True"
                            SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" />
                    </Grid>
                    <ControlTemplate.Triggers>
                        <Trigger Property="UIElement.IsMouseOver" Value="True">
                            <Setter TargetName="checkBoxBorder" Property="Background" Value="{DynamicResource CheckboxHoveredBackground}" />
                            <Setter TargetName="optionMark" Property="Fill" Value="{DynamicResource CheckboxHoveredTickColor}" />
                            <Setter TargetName="indeterminateMark" Property="Fill" Value="{DynamicResource CheckboxHoveredTickColor}" />
                        </Trigger>
                        <Trigger Property="IsEnabled" Value="False">
                            <Setter TargetName="checkBoxBorder" Property="Background" Value="{DynamicResource CheckboxDisabledBackground}" />
                            <Setter TargetName="checkBoxBorder" Property="BorderBrush" Value="{DynamicResource CheckboxDisabledOutlineColor}" />
                            <Setter TargetName="optionMark" Property="Fill" Value="{DynamicResource CheckboxDisabledTickColor}" />
                            <Setter TargetName="indeterminateMark" Property="Fill" Value="{DynamicResource CheckboxDisabledTickColor}" />
                        </Trigger>
                        <Trigger Property="IsPressed" Value="True">
                            <Setter TargetName="checkBoxBorder" Property="Background" Value="{DynamicResource CheckboxPressedBackground}" />
                        </Trigger>
                        <Trigger Property="ToggleButton.IsChecked" Value="True">
                            <Setter TargetName="optionMark" Property="UIElement.Opacity" Value="1" />
                            <Setter TargetName="indeterminateMark" Property="UIElement.Opacity" Value="0" />
                        </Trigger>
                        <Trigger Property="ToggleButton.IsChecked" Value="{x:Null}">
                            <Setter TargetName="optionMark" Property="UIElement.Opacity" Value="0" />
                            <Setter TargetName="indeterminateMark" Property="UIElement.Opacity" Value="1" />
                        </Trigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
</ResourceDictionary>