horizontal listview cant get full width it shrink, any solution?

<ListView.ItemTemplate>

                                    </Frame>
                                </ViewCell>
                            </DataTemplate>
                        </ListView.ItemTemplate>
                    </ListView>
                </Grid>

this is a list view inside a grid, there in the viewcell will show a label which is in the frame because i want a round shape label.
this listview should give full width on the phone but just showing very small on the left corner. please help