MainWindow.xaml

<Window x:Class="Simvars.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:Simvars"
        xmlns:simco="clr-namespace:Microsoft.FlightSimulator.SimConnect;assembly=Microsoft.FlightSimulator.SimConnect"
        xmlns:scm="clr-namespace:System.ComponentModel;assembly=WindowsBase"
        xmlns:sys="clr-namespace:System;assembly=mscorlib"
        mc:Ignorable="d"
        Title="MainWindow" Height="700" Width="800" MinWidth="800" MinHeight="700">

    <Window.Resources>
        <ObjectDataProvider x:Key="SimObjectTypeFromEnum" MethodName="GetValues" ObjectType="{x:Type sys:Enum}">
            <ObjectDataProvider.MethodParameters>
                <x:Type TypeName="simco:SIMCONNECT_SIMOBJECT_TYPE"/>
            </ObjectDataProvider.MethodParameters>
        </ObjectDataProvider>
        <CollectionViewSource x:Key="AlphaSortedSimvarNames" Source="{Binding aSimvarNames}">
            <CollectionViewSource.SortDescriptions>
                <scm:SortDescription />
            </CollectionViewSource.SortDescriptions>
        </CollectionViewSource>
        <CollectionViewSource x:Key="AlphaSortedUnitNames" Source="{Binding aUnitNames}">
            <CollectionViewSource.SortDescriptions>
                <scm:SortDescription />
            </CollectionViewSource.SortDescriptions>
        </CollectionViewSource>
    </Window.Resources>

    <Grid>
        <TextBlock Width="236" Margin="10,11,546,-11" Height="23" HorizontalAlignment="Left" VerticalAlignment="Top">
            <Hyperlink x:Name="hl_SimConnect" NavigateUri="https://msdn.microsoft.com/en-us/library/cc526983.aspx" RequestNavigate="LinkOnRequestNavigate">
                SimConnect Reference
            </Hyperlink>
        </TextBlock>
        <TextBlock Margin="10,33,546,613" Width="236" VerticalAlignment="Top" HorizontalAlignment="Left" Height="23">
            <Hyperlink x:Name="hl_SimVariables" NavigateUri="https://msdn.microsoft.com/en-us/library/cc526981.aspx" RequestNavigate="LinkOnRequestNavigate" >
                Simulation Variables Reference
            </Hyperlink>
        </TextBlock>

        <Button x:Name="btn_Connection" Content="{Binding sConnectButtonLabel}" Command="{Binding cmdToggleConnect}" HorizontalAlignment="Left" Margin="29,68,0,0" VerticalAlignment="Top" Width="217" Height="48"/>
        <Button x:Name="btn_LoadFile" Content="Load File" Command="{Binding cmdLoadFiles}" HorizontalAlignment="Left" Margin="29,156,0,0" VerticalAlignment="Top" Width="100" Height="23" RenderTransformOrigin="0.423,0.841"/>
        <Button x:Name="btn_SaveFile" Content="Save File" Command="{Binding cmdSaveFile}" HorizontalAlignment="Left" Margin="148,156,0,0" VerticalAlignment="Top" Width="100" Height="23"/>
        <CheckBox Content="Save values" IsChecked="{Binding bSaveValues, Mode=TwoWay}" HorizontalAlignment="Left" Margin="167,184,0,0" VerticalAlignment="Top" RenderTransformOrigin="0.597,0.489"/>

        <ListView x:Name="lv_Simvars" ItemsSource="{Binding lSimvarRequests}" SelectedItem="{Binding oSelectedSimvarRequest, Mode=OneWayToSource}" Margin="270,10,10,10">
            <ListView.ItemContainerStyle>
                <Style TargetType="ListViewItem">
                    <Style.Triggers>
                        <DataTrigger Binding="{Binding bStillPending}" Value="True">
                            <Setter Property="Background" Value="#55D3D373" />
                        </DataTrigger>
                    </Style.Triggers>
                </Style>
            </ListView.ItemContainerStyle>
            <ListView.ContextMenu>
                <ContextMenu>
                    <MenuItem Header="Remove" Command="{Binding cmdRemoveSelectedRequest}" />
                </ContextMenu>
            </ListView.ContextMenu>
            <ListView.View>
                <GridView>
                    <GridViewColumn Header="Simvar" Width="200" DisplayMemberBinding="{Binding sName}"/>
                    <GridViewColumn Header="Value" Width="150" DisplayMemberBinding="{Binding dValue, StringFormat=\{0:F9\}}"/>
                    <GridViewColumn Header="Units" Width="150" DisplayMemberBinding="{Binding sUnits}"/>
                </GridView>
            </ListView.View>
        </ListView>

        <Label Content="SimObject" HorizontalAlignment="Left" Margin="10,208,0,0" VerticalAlignment="Top" Height="23" Width="83"/>
        <ComboBox x:Name="cbb_SimObjectType" ItemsSource="{Binding Source={StaticResource SimObjectTypeFromEnum}}" SelectedValue="{Binding eSimObjectType, Mode=OneWayToSource}" SelectedIndex="0" HorizontalAlignment="Left" Margin="11,231,0,0" VerticalAlignment="Top" Width="119" Height="23"/>
        <Label Content="ObjectID" HorizontalAlignment="Left" Margin="165,208,0,0" VerticalAlignment="Top" Height="23" Width="71"/>
        <ComboBox x:Name="cbb_ObjectIds" ItemsSource="{Binding lObjectIDs}" SelectedValue="{Binding iObjectIdRequest, Mode=OneWayToSource}" IsEnabled="{Binding bObjectIDSelectionEnabled}" SelectedIndex="0" HorizontalAlignment="Left" Margin="165,231,0,0" VerticalAlignment="Top" Width="48" Height="23"/>

        <Label Content="Simvar Name" HorizontalAlignment="Left" Margin="10,259,0,0" VerticalAlignment="Top" Height="23" Width="83"/>
        <ComboBox x:Name="cbb_SimvarNames" ItemsSource="{Binding Source={StaticResource AlphaSortedSimvarNames}}" SelectedValue="{Binding sSimvarRequest, Mode=OneWayToSource}" SelectedIndex="0" HorizontalAlignment="Left" Margin="10,282,0,0" VerticalAlignment="Top" Width="238" Height="23"/>
        <Label Content="Index" HorizontalAlignment="Left" Margin="10,310,0,0" VerticalAlignment="Top" Height="23" Width="71"/>
        <ComboBox x:Name="cbb_Indices" ItemsSource="{Binding aIndices}" SelectedValue="{Binding iIndexRequest, Mode=OneWayToSource}" SelectedIndex="0" HorizontalAlignment="Left" Margin="10,333,0,0" VerticalAlignment="Top" Width="45" Height="23"/>
        <Label Content="Units" HorizontalAlignment="Left" Margin="70,310,0,0" VerticalAlignment="Top" Height="23" Width="83"/>
        <ComboBox x:Name="cbb_UnitNames" ItemsSource="{Binding Source={StaticResource AlphaSortedUnitNames}}" SelectedValue="{Binding sUnitRequest, Mode=OneWayToSource}" SelectedIndex="0" HorizontalAlignment="Left" Margin="70,333,0,0" VerticalAlignment="Top" Width="178" Height="23"/>
        <Button x:Name="btn_Request" Content="Add request &gt;" Command="{Binding cmdAddRequest}" HorizontalAlignment="Left" Margin="158,370,0,0" VerticalAlignment="Top" Width="90" Height="23
                "/>

        <Label Content="Value" HorizontalAlignment="Left" Margin="10,396,0,0" VerticalAlignment="Top" Height="23" Width="83"/>
        <TextBox x:Name="tb_SetValue" PreviewTextInput="NumberValidationTextBox" Text="{Binding sSetValue, Mode=OneWayToSource}" HorizontalAlignment="Left" Height="23" Margin="10,419,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="120"/>
        <Button x:Name="btn_TrySetValue" Content="Try set value &gt;" Command="{Binding cmdTrySetValue}" IsEnabled="{Binding bConnected}" HorizontalAlignment="Left" Margin="158,419,0,0" VerticalAlignment="Top" Width="90" Height="23"/>

        <Ellipse HorizontalAlignment="Left" Height="14" Margin="251,10,0,0" Stroke="Black" VerticalAlignment="Top" Width="14">
            <Ellipse.Style>
                <Style TargetType="Ellipse">
                    <Style.Triggers>
                        <DataTrigger Binding="{Binding bConnected}" Value="false">
                            <Setter Property="Fill" Value="#FFFF5030" />
                        </DataTrigger>
                        <DataTrigger Binding="{Binding bConnected}" Value="true">
                            <Setter Property="Fill" Value="#FF50FF30" />
                        </DataTrigger>
                        <DataTrigger Binding="{Binding bOddTick}" Value="true">
                            <!-- Assume bOddTick is true only when bConnected is true-->
                            <Setter Property="Fill" Value="#FF45E2F4" />
                        </DataTrigger>
                    </Style.Triggers>
                </Style>
            </Ellipse.Style>
        </Ellipse>

        <Label Content="Errors" HorizontalAlignment="Left" Margin="10,454,0,0" VerticalAlignment="Top" Height="23" Width="83"/>

        <ListBox ItemsSource="{Binding lErrorMessages}" RenderTransformOrigin="0.5,0.5" Width="236" HorizontalAlignment="Left" Margin="10,482,0,10">
            <ListBox.ItemContainerStyle>
                <Style TargetType="ListBoxItem">
                    <Setter Property="Foreground" Value="Red"/>
                </Style>
            </ListBox.ItemContainerStyle>
            <ListBox.ItemsPanel>
                <ItemsPanelTemplate>
                    <VirtualizingStackPanel VerticalAlignment="Bottom"/>
                </ItemsPanelTemplate>
            </ListBox.ItemsPanel>
        </ListBox>
        <CheckBox Content="Use FSX-compatible configuration" IsChecked="{Binding bFSXcompatible, Mode=TwoWay}" HorizontalAlignment="Left" Margin="29,121,0,0" VerticalAlignment="Top" Width="217"/>

    </Grid>

</Window>