Threading Problem in Vb.net

Private Delegate Sub DoInitializedDelegate() 
 
Public motdet As New Thread(AddressOf MotionDetection)
 
Private Sub MotionDetection()
'Do motion detection Work
'It is never ending Loop until form unload.
End Sub

Then I start it in my form load event.

Private Sub frmScan_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
motdet.Start()   	
End Sub

So my problem started when i load the form. 

i can see the form but it is like loading something.

i thought my motion detecting thread is never ending loop until form unload.

i cannot type anything inside two text box i mentions in above.

how should i do ? pls help me.

thanks

best rgds,

df