private async void FillInputValues()
{
var fixture = await FixtureService.GetById(_selectedFixtureId);
txtName.Text = fixture.Name;
txtDescription.Text = fixture.Description;
txtPrice.Text = fixture.Price.ToString();
dtpPurchase.Value = fixture.DatePurchase.Date;
dtpWarranty.Value = fixture.DateWarranty.Date;
var selectedSupplier = _suppliers.Find(s => s.Id == fixture.SupplierId);
var selectedCategory = _categories.Find(c => c.Id == fixture.CategoryId);
cmbSupplier.SelectedItem = new { Display = selectedSupplier.Name, Value = selectedSupplier.Id };
cmbCategory.SelectedItem = new { Display = selectedCategory.Name, Value = selectedCategory.Id };
}