private async void buttonGrad_Click(object sender, EventArgs e)
        {
            FormDodajGrad form = new FormDodajGrad();

            if (form.ShowDialog() == DialogResult.OK)
            {
                await LoadGradovi();
            }
        }
        private async void buttonGrad_Click(object sender, EventArgs e)
        {
            FormDodajGrad form = new FormDodajGrad();


            if (form.ShowDialog() == DialogResult.OK)
            {
                //var listgradovi = await servicegrad.get<List<Model.Grad>>(null);
                //cmbGradovi.DataSource = listgradovi;

                await LoadGradovi();
            }
        }