Here i made "AllowGroupExpandCollapse" as true. and here i used custom caption summary template which includes check box, label and icon.so when i customize it, i could not able to see the expand/collapse icon. Please check once the below images.
in this case i could not find the icons. your sample project is not related like this.
public partial class MainPage : ContentPage
indicator = new SfBusyIndicator();
dataGrid.GroupExpanding += DataGrid_GroupExpanding;
private async void DataGrid_GroupExpanding(object sender, GroupChangingEventArgs e)
//// customize based on the requirement.
indicator.IsBusy = true;
indicator.IsVisible = true;
indicator.AnimationType = AnimationTypes.SlicedCircle;
indicator.IsBusy = false;
indicator.IsVisible = false;