private async void ListBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            int it = ((ListBox)sender).SelectedIndex;

            PreviewControl.Change_Item(it);
            Color c = await Get_Color();

            _R.Text = c.R.ToString();
            _G.Text = c.G.ToString();
            _B.Text = c.B.ToString();

            try
            {
                _RSlider.Value = double.Parse(c.R.ToString());
                _GSlider.Value = double.Parse(c.G.ToString());
                _BSlider.Value = double.Parse(c.B.ToString());
            }
            catch (Exception ex)
            {
                MessageDialog msg = new MessageDialog(ex.Message.ToString(), ex.HResult.ToString());
                await msg.ShowAsync();

                System.Diagnostics.Debug.WriteLine(ex.Message);
            }

            Update_Hex(c);

            PreviewControl.Update_ColorOnPreview(-1, await Generate_BandTheme());
        }