scratchpad.md

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        <Button Content="___" Command="{Binding MinimizeToTrayCommand}" ToolTip="{x:Static resx:GUI.MainForm_TrayButton}"/>

		                                <controls:CommandComboBox x:Name="cbListBridge" ItemsSource="{Binding ListBridges}" DisplayMemberPath="LongName" SelectedItem="{Binding SelectedBridge}" HorizontalAlignment="Right"  VerticalAlignment="Top" Width="200" Height="26" BorderThickness="0">
                                <controls:CommandComboBox.Style>
                                    <Style TargetType="{x:Type ComboBox}">
                                        <Setter Property="Visibility" Value="Visible"/>
                                        <Setter Property="Background" Value="Transparent"/>
                                        <Setter Property="BorderBrush" Value="Transparent"/>
                                        <Style.Triggers>
                                            <DataTrigger Binding="{Binding MultiBridgeCB}" Value="False">
                                                <Setter Property="Visibility" Value="Collapsed"/>
                                            </DataTrigger>
                                        </Style.Triggers>
                                    </Style>
                                </controls:CommandComboBox.Style>
                            </controls:CommandComboBox>