Hi,

I have a XamDataGrid showing Orders. Orders have associated Tasks. I have these displayed hierarchically in a grid but due to the fact the data is being sent over a WCF service I want to Lazy Load the Tasks (child rows) to speed up the initial loading of the grid. I tried to do this by binding the Tasks via a property like so:

private List<TaskDTO> _tasks = null;
public List<TaskDTO> Tasks
{
get
{
if (_tasks == null)
_tasks = GetTasks(OrderId);

return _tasks;
}
}

However when I hit the plus sign to expand the Child Rows it looks like it is going to expand and then doesn't. The plus sign turns to a minus sign but with no data in there. 

I have checked data is actually returned from the service and is placed into the _tasks variable. 

The above property also only seems to be evaluated the first time I hit the plus (I guess this is some kind of caching in the xamDataGrid).

Is there a better way of trying to lazy load the child rows or am I missing something with how I am trying to implement it?

Cheers,
Dave