Thread callback to main thread

I've started experimenting with threads in PB.net.

I'm using this well known code to start up a thread with just populates an instance datastore with some rows.

// In main thread, fire up background thread which retrieves data

long ll_cnt

System.Threading.Thread l_thread

System.Threading.ThreadStart l_process

l_process = of_getDwData()

l_thread = create System.Threading.Thread(l_process)

l_thread.IsBackground = true

l_thread.Start()

And in the of_getDwData function:

// In function of_getDwData() which the thread is running

integer li_cnt

// Fill the instance datastore with data

for li_cnt = 1 to 10

          ids_left.InsertRow( 0 )

          ids_left.Object.rownumber[ li_cnt ] = li_cnt

next

// When this function is done i would like to go back to the main thread, using some kind of callback.

MainThread.of_threadIsDone()

And in the callback function, a DataWindow on the window can just copy the data fetched.

// In function of_threadIsDone that is runned on main thread.

// Copy the fetched data!

dw_1.object.data = ids_data.object.data

I've tried lots of stuff calling from the thread back to the main thread without success.

Could anyone please give me some pointers?