unity Editor dialog

dialog.js

class MyDialog extends EditorWindow {
	@MenuItem("Terrain/Dialog Test")
	
	static function ShowWindow() {
		var window:MyDialog = EditorWindow.GetWindow(MyDialog);
	}

	static function load_section(){
		print('load section');
	}
	
	var section_id = "";

	function OnGUI() {
	
		section_id = GUI.TextField( Rect(20, 40, 200, 30), section_id);
	
		if (GUI.Button( Rect (220, 40, 80, 20), "Load Terrain")){
			MyDialog.load_section();
		}
		
		if (GUI.Button( Rect (220, 140, 80, 20), "2 Terrain")){
			print ('button clicked');
		//	load_section(section_id);
		}
	}
	
}