Is there a way to asynchronously populate row children before (or during) expanding?

[TETYYS]

I am looking at files page sample (https://github.com/AvaloniaUI/Avalonia.Controls.TreeDataGrid/blob/master/samples/TreeDataGridDemo/ViewModels/FilesPageViewModel.cs) which loads row children on access (https://github.com/AvaloniaUI/Avalonia.Controls.TreeDataGrid/blob/master/samples/TreeDataGridDemo/Models/FileTreeNodeModel.cs#L80), however all of it is synchronous I/O access.

Is there a way maybe pre-load data so that .Children access would get it from cache? By the looks of it, as soon as you expand a row, everything in chain expects data to be ready immediately, so there is no point in time one could load data asynchronously.

[slavslavin]

Hello,
We use Behavior<TreeDataGrid> and subscribe on HierarchicalTreeDataGridSource<object>.RowExpanding event by using reflection. In event handler we start async children loading (vm layer) and after complete expand node in tree view.