// this is a regular constructor:
HomeBudgetCategories::HomeBudgetCategories() {
	Add(spl.Horz(groups, categories));
	spl.SetPos(2000);

	groups.AddIndex(ID);
	groups.AddColumn(NAME, t_("Category")).Edit(eg);
	groups.Appending().Removing().Editing().Accepting().Canceling();
	groups.RejectNullRow();
	groups.SetToolBar();
	groups.WhenInsertRow = THISBACK(InsertGroup);
	groups.WhenUpdateRow = THISBACK(UpdateGroup);
	groups.WhenRemoveRow = THISBACK(RemoveGroup);
	groups.WhenChangeRow = THISBACK(ChangeGroup);

	categories.AddIndex(ID);
	categories.AddColumn(NAME, t_("Name")).Edit(ec);
	categories.AddColumn(DEFVALUE, t_("Default value")).Edit(defval).SetConvert(Single<ConvDouble>());
	categories.AddColumn(PM, t_("Plus / Minus")).Edit(dlpm).SetConvert(dlpm).Default(-1);
	categories.AddColumn(INNEWMONTH, t_("Default for a new month")).Edit(yesno).SetConvert(yesno).Default(0);
	categories.WhenInsertRow = THISBACK(InsertCategory);
	categories.WhenUpdateRow = THISBACK(UpdateCategory);
	categories.WhenRemoveRow = THISBACK(RemoveCategory);
	categories.WhenAcceptedRow = THISBACK(UpdateCategories);
	categories.Appending().Removing().Editing();
	categories.RejectNullRow();
	categories.SetToolBar();

	category.Resizeable(false).Header(false);
	category.AddPlus(THISBACK(NewCategory));
}

// ... and here is a function that (re)sets all the translated strings:
void HomeBudgetCategories::Setup() {
	// groups and categories are GridCtrls
	groups.GetColumn(1).Name(t_("Category"));

	categories.GetColumn(1).Name(t_("Name"));
	categories.GetColumn(2).Name(t_("Default value"));
	categories.GetColumn(3).Name(t_("Plus / Minus"));
	categories.GetColumn(4).Name(t_("Default for a new month"));
	//dlpm and yesno are DropGrid instances
	dlpm.Clear();
	dlpm.Add(-1, t_("Minus")).Add(1, t_("Plus"));
	yesno.Clear();
	yesno.Add(0, t_("No")).Add(1, t_("Yes"));

	LoadGroups();
	UpdateCategories();
	category <<= callback(expenses, &HomeBudgetExpenses::UpdateValue);
}

void HomeBudget::Options()
{
	WithOptionsLayout<TopWindow> dlg;
	CtrlLayoutOK(dlg, t_("Options"));
	Index<int> langs = GetLngSet(); // gets list of known languages
	for(int i = 0; i < langs.GetCount(); i++){
		// we iterate and search for translated strings - "Home budget" is a 
		// randomly chosen string that is probable to be translated 
		// in all languages (except English of course)
		String str = GetLngString(langs[i], "Home budget");
		if (i == 0 || str != "Home budget")
			// if the string is translated we add the language to the DropList
			dlg.lang.Add(langs[i], GetNativeLangName(langs[i]));
	}
	dlg.lang.SetIndex(max(dlg.lang.Find(GetCurrentLanguage()),0));
	dlg.clear <<= THISBACK(ClearAll);
	// check if the dialog was canceled or OKed
	if(dlg.Execute() != IDOK)
		return;
	// user clicked OK, lets change the language and reset all the strings
	SetLanguage(~dlg.lang);
	Setup();
}