Using Grid as ItemsPanel

Question

Hello everyone,

I am using a Grid for the ItemsPanel of an ItemsControl. It is looks like this;

 <ItemsControl ItemsSource="{Binding days}">    
                            <ItemsControl.ItemsPanel>
                                <ItemsPanelTemplate>
                                    <Grid>
                                        <Grid.ColumnDefinitions>
                                            <ColumnDefinition/>
                                            <ColumnDefinition/>
                                            <ColumnDefinition/>
                                            <ColumnDefinition/>
                                            <ColumnDefinition/>
                                            <ColumnDefinition/>
                                            <ColumnDefinition/>
                                        </Grid.ColumnDefinitions>
                                        <Grid.RowDefinitions>
                                            <RowDefinition/>
                                            <RowDefinition/>
                                            <RowDefinition/>
                                            <RowDefinition/>
                                            <RowDefinition/>
                                        </Grid.RowDefinitions>
                                    </Grid>
                                </ItemsPanelTemplate>
                            </ItemsControl.ItemsPanel>
</ItemsControl>

I want to set row and column property of the items at runtime. What should I do?
Thanks.