ReportWindow.xaml

<Window
    x:Class="Furtherance.ReportWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:Furtherance"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    Closed="Window_Closed"
    mc:Ignorable="d">

    <Grid Width="400" RowSpacing="15">
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="*"/>
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="*"/>
        </Grid.ColumnDefinitions>
        <ComboBox x:Name="timeframeCombo" Header="Timeframe" SelectedIndex="1" PlaceholderText="Pick a timeframe" Width="200" HorizontalAlignment="Center" SelectionChanged="Timeframe_SelectionChanged">
            <x:String>Past week</x:String>
            <x:String>This month</x:String>
            <x:String>Past 30 days</x:String>
            <x:String>Past 180 days</x:String>
            <x:String>Past year</x:String>
            <x:String>Date range</x:String>
        </ComboBox>
        <StackPanel x:Name="pickADatePanel" Orientation="Horizontal" HorizontalAlignment="Center" Spacing="20" Visibility="Collapsed" Grid.Row="1">
            <CalendarDatePicker x:Name="startCalendar" PlaceholderText="Pick a date" Header="From" DateChanged="Calendar_DateChanged"/>
            <CalendarDatePicker x:Name="endCalendar" PlaceholderText="Pick a date" Header="To" DateChanged="Calendar_DateChanged"/>
        </StackPanel>
        <RadioButtons x:Name="sortRadio" Header="Sort by:" MaxColumns="2" HorizontalAlignment="Center" SelectedIndex="0" Grid.Row="2">
            <RadioButton Content="Task"/>
            <RadioButton Content="Tag"/>
        </RadioButtons>
        <CheckBox x:Name="filterCheck" Content="Filter by task or tags" HorizontalAlignment="Center" Click="Filter_Checked" Grid.Row="3"/>
        <StackPanel x:Name="filterPanel" Orientation="Horizontal" HorizontalAlignment="Center" Spacing="5" Visibility="Collapsed" Grid.Row="4">
            <ComboBox x:Name="filterCombo" Width="100" SelectedIndex="0">
                <x:String>Tasks</x:String>
                <x:String>Tags</x:String>
            </ComboBox>
            <TextBox x:Name="filterTextBox" Width="200" HorizontalAlignment="Center" PlaceholderText="Task, Task 2"/>
        </StackPanel>
        <Button Content="Refresh" HorizontalAlignment="Center" Click="Refresh_Click" Grid.Row="5"/>
        <TextBlock x:Name="totalTimeText" Visibility="Collapsed" TextAlignment="Center" FontWeight="Bold" Grid.Row="6"/>
        <TreeView x:Name="TreeViewData" Grid.Row="7">
            <TreeView.ItemTemplate>
                <DataTemplate x:DataType="local:TaskReportGroup">
                    <TreeViewItem ItemsSource="{x:Bind TaskReportSubGroup}">
                        <TreeViewItem.Content>
                            <Grid>
                                <Grid.ColumnDefinitions>
                                    <ColumnDefinition Width="*"/>
                                    <ColumnDefinition Width="*"/>
                                </Grid.ColumnDefinitions>
                                <TextBlock x:Name="taskNameBlock" Text="{x:Bind Key}" TextTrimming="CharacterEllipsis"/>
                                <TextBlock Text="{x:Bind TotalTime}" TextAlignment="Right" Grid.Column="1" Margin="0 0 15 0" TextTrimming="CharacterEllipsis"/>
                            </Grid>
                        </TreeViewItem.Content>
                    </TreeViewItem>
                </DataTemplate>
            </TreeView.ItemTemplate>
        </TreeView>
    </Grid>
</Window>