private void BDelete_Click(object sender, RoutedEventArgs e) { try { var listBox = (ListBox)((TabItem)PlayListTabs.SelectedItem).FindName("PlayListBox"); if (listBox != null) { var audio = (Audio)listBox.SelectedItem; VkApi.DeleteAudio(audio.OwnerID, audio.ID); listBox.Items.Remove(listBox.SelectedItem); } } catch (NetworkInformationException) { System.Windows.Forms.MessageBox.Show(@"Ошибка интернет соединения."); } }