async void menuitem_Click(object sender, EventArgs e)
{
isDownloading = true;
buildLoaded = false;
loading.Visibility = Visibility.Visible;
loading.IsIndeterminate = true;
clear();
// download staff and show them to the map
var fsdf = await DownloadPoisBuildStaff(_selectedBuild);
ReadAllBuildingFloorsFromIsolatedStorage(_selectedBuild);
ReadPoisByBuildingFromIsolatedStorage(_selectedBuild);
addBuildingsToMap(_selectedBuild);
buildLoaded = true;
loadBuidingToMap(_selectedBuild);
loading.Visibility = Visibility.Collapsed;
loading.IsIndeterminate = false;
createAppBarMenuItem();
isDownloading = false;
_searchBuilding = true;
}