private void lv_Assignments_MouseDoubleClick(object sender, MouseButtonEventArgs e) { if (this.SelectedAssignment != null) { CheckForSubtasksForAssignmentAndCreateIfNecessary(this.SelectedAssignment.Id); var addEntryDialog = new AddEntry(this.SelectedAssignment.ProjectId, this.SelectedAssignment.Id); addEntryDialog.ShowDialog(); } }