Hi,

I am using the code given at a post 

http://ko.infragistics.com/community/forums/t/64661.aspx

in addition to this i am using this style sheet resource

which is as below, for this sheet i am able to achieve Select all, but the problem is If the dropdown is having only one item, then it doesn't show up, it only shows Select all.Please help

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:igEditors="http://schemas.infragistics.com/xaml"
xmlns:ig="http://schemas.infragistics.com/xaml"
xmlns:System="clr-namespace:System;assembly=mscorlib"
xmlns:common="clr-namespace:Room.Functional.EAPolicy.CommonClass"
xmlns:igPrim="http://schemas.infragistics.com/xaml/primitives">

<common:CheckAllCommand x:Key="CheckAllCommand"/>
<common:ArrayConverter x:Key="converter"/>
<common:CheckBoxIsCheckedConverter x:Key="CheckBoxIsCheckedConverter"/>
<LinearGradientBrush x:Key="SilverlightDarkBrush" EndPoint="0.5,1" StartPoint="0.5,0">
<GradientStop Color="#FFA3AEB9" Offset="0"/>
<GradientStop Color="#FF8399A9" Offset="0.375"/>
<GradientStop Color="#FF718597" Offset="0.375"/>
<GradientStop Color="#FF617584" Offset="1"/>
</LinearGradientBrush>
<SolidColorBrush x:Key="SilverlightBackgroundBrush" Color="#FF1F3B53"/>

<Style x:Key="toggleButtonStyle" TargetType="ToggleButton">
<Setter Property="Foreground" Value="#FF333333"/>
<Setter Property="BorderBrush" Value="{StaticResource SilverlightDarkBrush}"/>
<Setter Property="BorderThickness" Value="1"/>
<Setter Property="Padding" Value="2"/>
<Setter Property="Cursor" Value="Hand"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ToggleButton">
<Grid>

<Grid>
<Border x:Name="Background" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" CornerRadius="2"/>
<Border x:Name="BackgroundOverlay" Background="#FF448DCA" BorderBrush="#FF448DCA" BorderThickness="{TemplateBinding BorderThickness}" CornerRadius="2" Opacity="0"/>
<Border x:Name="BackgroundOverlay2" Background="#FF448DCA" BorderBrush="#00000000" BorderThickness="{TemplateBinding BorderThickness}" CornerRadius="1" Opacity="0"/>
<Border x:Name="BackgroundGradient" BorderBrush="#FFFFFFFF" BorderThickness="1" CornerRadius="1" Margin="{TemplateBinding BorderThickness}">
<Border.Background>
<LinearGradientBrush EndPoint=".7,1" StartPoint=".7,0">
<GradientStop Color="#FFFFFFFF" Offset="0"/>
<GradientStop Color="#F9FFFFFF" Offset="0.375"/>
<GradientStop Color="#E5FFFFFF" Offset="0.625"/>
<GradientStop Color="#C6FFFFFF" Offset="1"/>
</LinearGradientBrush>
</Border.Background>
</Border>
<Border x:Name="BackgroundOverlay3" Background="#FF448DCA" BorderBrush="#00000000" BorderThickness="{TemplateBinding BorderThickness}" CornerRadius="1" Opacity="0"/>
<Border x:Name="BackgroundGradient2" BorderBrush="#FFFFFFFF" BorderThickness="1" CornerRadius="0,1,1,0" Margin="{TemplateBinding BorderThickness}" Opacity="0">
<Border.Background>
<LinearGradientBrush EndPoint=".7,1" StartPoint=".7,0">
<GradientStop Color="#FFFFFFFF" Offset="0"/>
<GradientStop Color="#F9FFFFFF" Offset="0.375"/>
<GradientStop Color="#E5FFFFFF" Offset="0.625"/>
<GradientStop Color="#C6FFFFFF" Offset="1"/>
</LinearGradientBrush>
</Border.Background>
</Border>
<Border x:Name="Highlight" BorderBrush="#FF6DBDD1" BorderThickness="{TemplateBinding BorderThickness}" CornerRadius="1" Margin="{TemplateBinding BorderThickness}" IsHitTestVisible="false" Opacity="0"/>
<ContentPresenter x:Name="contentPresenter" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" Margin="{TemplateBinding Padding}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}" Content="{TemplateBinding Content}" ContentTemplate="{TemplateBinding ContentTemplate}"/>
<Border x:Name="FocusVisualElement" BorderBrush="#FF6DBDD1" BorderThickness="1" CornerRadius="1" Margin="1" IsHitTestVisible="false" Visibility="Collapsed"/>
</Grid>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<Style TargetType="ig:ComboEditorItemControl">
<Setter Property="Margin" Value="20,0,0,0"/>
</Style>
<Style TargetType="ig:XamComboEditor">
<Setter Property="Padding" Value="4,2"/>
<Setter Property="MinHeight" Value="22"/>
<Setter Property="HorizontalContentAlignment" Value="Left"/>
<Setter Property="VerticalContentAlignment" Value="Center"/>
<Setter Property="BorderThickness" Value="1"/>
<Setter Property="Background" Value="{StaticResource SilverlightBackgroundBrush}"/>
<Setter Property="BorderBrush" Value="{StaticResource SilverlightDarkBrush}"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ig:XamComboEditor">
<Grid >
<VisualStateManager.VisualStateGroups>

<VisualStateGroup x:Name="DropDownStates">
<VisualState x:Name="Closed"/>
<VisualState x:Name="Open">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="Popup" Storyboard.TargetProperty="IsOpen">
<DiscreteObjectKeyFrame KeyTime="00:00:00">
<DiscreteObjectKeyFrame.Value>
<System:Boolean>True</System:Boolean>
</DiscreteObjectKeyFrame.Value>
</DiscreteObjectKeyFrame>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>

<Border x:Name="ContentPresenterBorder">
<Grid x:Name="gridLayout" ShowGridLines="False" >
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
<ColumnDefinition Width="17" />
</Grid.ColumnDefinitions>

<Popup x:Name="Popup"
VerticalAlignment="Bottom"
IsOpen="False"
Grid.ColumnSpan="2" >

<Border x:Name="RootPopupElement"
Height="Auto"
MaxHeight="{TemplateBinding MaxDropDownHeight}"
HorizontalAlignment="Stretch"
BorderBrush="{TemplateBinding BorderBrush}"
BorderThickness="{TemplateBinding BorderThickness}"
CornerRadius="3" >
<Border.Background>
<LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
<GradientStop Color="#FFFFFFFF" Offset="0"/>
<GradientStop Color="#FFFEFEFE" Offset="1"/>
</LinearGradientBrush>
</Border.Background>

<Grid>
<Grid.ColumnDefinitions>

<ColumnDefinition Width="*"/>
<ColumnDefinition Width="Auto"/>
</Grid.ColumnDefinitions>

<Grid.RowDefinitions>

<RowDefinition Height="20"/>
<RowDefinition Height="*"/>
<RowDefinition Height="Auto"/>

</Grid.RowDefinitions>

<CheckBox Grid.Row="0" Command="{StaticResource CheckAllCommand}" Content="Select All">
<CheckBox.CommandParameter>
<MultiBinding Converter="{StaticResource converter}">
<Binding RelativeSource="{RelativeSource AncestorType=igEditors:XamComboEditor}"/>
<Binding RelativeSource="{RelativeSource Self}" Path="IsChecked"/>
</MultiBinding>
</CheckBox.CommandParameter>

<CheckBox.IsChecked>
<MultiBinding Converter="{StaticResource CheckBoxIsCheckedConverter}">
<Binding RelativeSource="{RelativeSource AncestorType=igEditors:XamComboEditor}" Mode="OneWay"/>
<Binding RelativeSource="{RelativeSource AncestorType=igEditors:XamComboEditor}" Path="SelectedItems.Count" Mode="OneWay"/>
</MultiBinding>
</CheckBox.IsChecked>

</CheckBox>

<igPrim:ItemsPanel Grid.Row="1" x:Name="ItemsPanel" />
<ScrollBar x:Name="VerticalScrollBar" Width="20" Grid.Row="1" Grid.Column="1"/>
<ScrollBar x:Name="HorizontalScrollBar" Height="20" Grid.Row="2" Grid.Column="0"/>
</Grid>
</Border>

</Popup>

<Border x:Name="borderEditMode" Background="#FFFFFFFF" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Grid.ColumnSpan="2" Visibility="Collapsed" CornerRadius="2"/>

<ToggleButton Grid.Row="1" x:Name="ToggleButton"
HorizontalAlignment="Stretch"
Style="{StaticResource toggleButtonStyle}"
VerticalAlignment="Stretch"
HorizontalContentAlignment="Right"
Grid.ColumnSpan="2"
IsTabStop="False"
Background="{TemplateBinding Background}"
BorderBrush="{TemplateBinding BorderBrush}"
BorderThickness="{TemplateBinding BorderThickness}"
IsChecked="{Binding IsDropDownOpen, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}"
Foreground="{TemplateBinding Foreground}">
<Grid VerticalAlignment="Center" Margin="3,0">
<Path x:Name="BtnArrowBackground" Stretch="Fill" Height="4" Margin="0,2,0,0"
Width="7" Data="M 0,0 C0,0 7,0 7,0 7,0 3.5,3.5 3.5,3.5 3.5,3.5 0,0 0,0 z">
<Path.Fill>
<SolidColorBrush x:Name="BtnArrowColorBackground" Color="#FFFFFFFF"/>
</Path.Fill>
</Path>
<Path x:Name="BtnArrowForeground" Stretch="Fill" Height="4"
Width="7" Data="M 0,0 C0,0 7,0 7,0 7,0 3.5,3.5 3.5,3.5 3.5,3.5 0,0 0,0 z">
<Path.Fill>
<SolidColorBrush x:Name="BtnArrowColorForeground" Color="#FF333333"/>
</Path.Fill>
</Path>
</Grid>
</ToggleButton>
<StackPanel x:Name="MultiSelectConentPanel" Orientation="Horizontal"
Margin="{TemplateBinding Padding}"
VerticalAlignment="{TemplateBinding VerticalContentAlignment}"
HorizontalAlignment="Stretch" />
</Grid>
</Border>

<Rectangle x:Name="FocusVisualElement" Stroke="#FF6DBDD1" StrokeThickness="1" RadiusX="1" RadiusY="1" Margin="1"
IsHitTestVisible="false" Opacity="0"/>

<Rectangle x:Name="DisabledVisualElement" Fill="White" RadiusX="1" RadiusY="1" IsHitTestVisible="false" Opacity="0"/>

</Grid>
</ControlTemplate>

</Setter.Value>
</Setter>

</Style>
</ResourceDictionary>