It´s difficult to explain, you must see the Grid:

1: These is a panel with some specific control like labels and textboxes, these columns could be rise dynamically this means there could be minimal one or many columns. the Description column only describes the rows.

2: These colums bind data to the grid, each colum must be sortable, filterable, fixing the header.

3. That column part are depending on the header columns of 1 , when i resize this columns, the columns of 1 also muste resize.

4: in the Footer there is also a new panel with some Rows with descriptions and values.

The problem is, that the columns of 1, 3 and 4 are one unit with different values. These units could be created dynamically, depends on a collection.

So i hope you could give me an advice for the best solution.

The next step, i must set on the right side of the Description Summary new columns for the values.

My idea was, to define 2 Styles and assign the columns with the specific style. But i read in this post that is not possible to use Styles by Key with the SummaryDefinition.

Any idea to add new summary columns??

    <my:FieldLayout x:Name="SummaryDescription">
 
                <my:FieldLayout.SummaryDefinitions>
 
                    <my:SummaryDefinition  Position="Center" />
                    <!--<my:SummaryDefinition PositionFieldName="Col3"   />-->
                    
                </my:FieldLayout.SummaryDefinitions>
                
            </my:FieldLayout>




private void SetSummaryToField(string fieldName)
        {
            SummaryDefinition summary = new SummaryDefinition();
            summary.SourceFieldName = fieldName;
            summary.Key = fieldName;
            
            SummaryDescription.SummaryDefinitions.Add(summary);
}







The red marked SummaryDefinition is set by Position="Center"
because, when i resize the columns width of RW|Col1 the text of the
 summary does not hide and it is not bound to one Column. 
On the picture you can see, that the SummaryDefinition is visible over
 the columns.

Problem 1: How can i put these SummaryDefinition on the same height
 like the others? When i set the specific Position for 
this SummaryDefinition, the described resizing doesn´t 
work!

Problem 2: The other SummaryDefinition are set dynamically, 
but how to set other Styles for SummaryDefinitions
 of Col1 - Col5  ?
I need there listed some Labels and Textboxes.