private void GoToFrameToolStripMenuItem_Click(object sender, EventArgs e) { if (MainTabControl.SelectedTab == null) { return; } var tab = MainTabControl.SelectedTab as MovieTab; var frameCount = tab.InputGrid.RowCount - 1; var dialog = new ValueDialog <int>("Enter frame:", "Jump To Frame", 0, int.Parse, 0, frameCount); if (dialog.ShowDialog() == DialogResult.OK) { GotoFrame(dialog.Value); } }