Accessing gridview' cells in wpf

Question

Hello,

I have a GridView as a content for ListView. As you can see in the code below I use a template for gridview cells. Now I would like to traverse every cell in particular column and set some values. Specifically I would like to select some range and change some text characteristics (for every row) This selection will be based on two sliders.

What are the possible ways to traverse every row (cell)?

Here is sample xaml code

<ListView.View>
            <GridView>
                <GridViewColumn Header="Nazwa1" Width="40">
                    <GridViewColumn.CellTemplate>
                        <DataTemplate>
                            <RichTextBox Text="{Binding Nazwa}" />
                        </DataTemplate>
                    </GridViewColumn.CellTemplate>

                    ...