window(
    width=600, height=600,
    x = 16, middle = 0,
    key = "course_edit_period"
) {
    content(style="course_edit_period") {
        title {
            "Modify Period"
        }
        label {
            "Lesson:"
        }
        lesson_details_window {
            lesson_details {
            }
        }
        dropdown(
            id = "lesson",
            value = 1,
            options = 1,
            option1 = "Select Lesson"
        ) {
            content {
                ""
            }
        }
        scroll_panel {
            scroll_bar {
                scroll_thumb
            }
            content(id="rooms") {
            }
        }
        button(
            width=168, height=40,
            id="add_room"
        ) {
            content {
                "Add Room"
            }
        }
        buttons {
            button(
                on_click="init#ui.emit_accept(node)",
                id="save"
            ) {
                content {
                    "Save"
                }
            }
        }
    }
}