It's ok with the color but i have a problem with column's height.

The column modif and pdf have a height problem.

My buttons are cut.

My table options are :

<ig:XamGrid x:Name="dataGrid"
AutoGenerateColumns="False"
ColumnWidth="auto"
FontSize="10"
FontFamily="Calibri"
Foreground="Black"
Grid.Column="0"
Grid.Row="1"
Grid.ColumnSpan="2"
RowHover="Row"
RowHeight="20"
Margin="5"
ItemsSource="{Binding ListeAfterFiltre}"
>

My buttons are set like this :

<ig:UnboundColumn Key="Modif" HeaderText="Modif" HorizontalContentAlignment="Center" VerticalContentAlignment="Center" Width="50">
<ig:UnboundColumn.ItemTemplate>
<DataTemplate>
<Button Style="{StaticResource EditButtonStyle}"
Height="18" Command="{Binding DataContext.AfficherDetailCommand,RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ig:XamGrid}}}" CommandParameter="{Binding RowData}"></Button>
</DataTemplate>
</ig:UnboundColumn.ItemTemplate>
</ig:UnboundColumn>

<ig:UnboundColumn Key="PDFFR" HeaderText="PDF FR" HorizontalContentAlignment="Center" VerticalContentAlignment="Center" IsGroupable="False" IsFilterable="False" IsResizable="False">
<ig:UnboundColumn.ItemTemplate>
<DataTemplate>
<Button Style="{StaticResource FlatIconeButton}" BorderBrush="White" Background="White" Name="FR"
Command="{Binding DataContext.AfficherPDFCommandFR,RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ig:XamGrid}}}" CommandParameter="{Binding RowData}"
Height="20" 
Width="20"
ToolTip="Afficher le PDF">
<ContentControl Style="{StaticResource ERP_PDF_ContentControlStyle}" 
BorderBrush="Black"/>
</Button>
</DataTemplate>
</ig:UnboundColumn.ItemTemplate>
</ig:UnboundColumn>

Look at picture

Hello EASii IC,

I have been looking into your question. I have updated the sample application I have sent in my previous post with the code snippet you have provided and I was not able to reproduce the behavior you have mentioned.

The binding errors that you are seeing are caused by the DataContext of the UnboundColumn. At first when the binding is created the DataContext of the UnboundField is not set. This is when the errors occur and the error message appears in the Output window. Then the DataContext(UnboundDataContext) is created for the UnboundField and the DataTrigger in the CellStyle is executed.

In release mode of the application these errors should have no influence on the performance of the application and there should not be a slowdown. In debug mode the errors are shown in the Output window and this is why the it might take time to write them in this window. In release mode on the other hand there is no Output window and the application would not take time for writing error messages. You can test this by setting the Solution Configuration to run as Release instead of Debug. One other way to test would be run the .exe file of the project.

Please do not hesitate to let me know if you have any further questions on this matter.

So i will have 1 error for each row ?

If i have 10k row, i'll have 10k error.

The treatment is not slow down ?

I have some errors with this : 

<ig:UnboundColumn Key="Modif" HeaderText="Modif" 
HorizontalContentAlignment="Center" VerticalContentAlignment="Center" Width="50" CellStyle="{StaticResource unbound}">
<ig:UnboundColumn.ItemTemplate> 
<DataTemplate>
<Button Height="18"
Command="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ig:XamGrid}}, Path=DataContext.Hello}" 
CommandParameter="{Binding RowData}"
Content="Test">

</Button>
</DataTemplate>
</ig:UnboundColumn.ItemTemplate>
</ig:UnboundColumn>

But i didn't get any error with this version : 

<ig:UnboundColumn Key="Modif" HeaderText="Modif" 
HorizontalContentAlignment="Center" VerticalContentAlignment="Center" Width="50">
<ig:UnboundColumn.ItemTemplate> 
<ig:UnboundColumn.CellStyle>
<Style TargetType="{x:Type ig:CellControl}">
<Setter Property="Padding" Value="5 1"/>
<Style.Triggers>

<DataTrigger Binding="{Binding RelativeSource={RelativeSource Self}, Path=DataContext.RowData.UniqueID}" Value="IC/140029">
<Setter Property="Background" Value="Red"/>
</DataTrigger>

</Style.Triggers>
</Style>
</ig:UnboundColumn.CellStyle>
<DataTemplate>
<Button Height="18"
Command="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ig:XamGrid}}, Path=DataContext.Hello}" 
CommandParameter="{Binding RowData}"
Content="Test">

</Button>
</DataTemplate>
</ig:UnboundColumn.ItemTemplate>
</ig:UnboundColumn>

I didn't understand why...

Hello EASii IC,

I have been looking into your question.

When the solution builds for the first time the DataContext for the UnboundColumn is not set. Then the DataContext for this column is set and the binding  for the CellContol is created.

When the application starts the binding is already created and the Background property is being set.

Please do not hesitate to let me know if you have any further questions on this matter.

When i use your sample i have some error in output : 

System.Windows.Data Error: 40 : BindingExpression path error: 'RowData' property not found on 'object' ''Worker' (HashCode=46243781)'. BindingExpression:Path=DataContext.RowData.UniqueID; DataItem='CellControl' (Name=''); target element is 'CellControl' (Name=''); target property is 'NoTarget' (type 'Object')

Hello EASii IC,

Thank you for the provided sample application. I was able to reproduce the issue. What I can suggest is to create an additional style for the UnboundColumns. In this style you can set the binding to the DataContext.RowData. UniqueID.

I have modified the sample application for you. Please find it attached and feel free to let me know if you have any further questions on this matter.