ok now works.
I have 2 needs.
1) I would at the start, like in case of selectedchanged, that listview (lv) was not visible
2) I want to change listview color
In both cases if I add istrucions the App wait many seconds to show listview and then doesn't consider the istuctions.
I modified your code.
Here the code.
Case 1
Private Sub et_TextChanged (Old As String, New As String)
lv.Clear
If lv.Visible = False Then lv.Visible = True
If et.Text=Null Then lv.Visible = False '<=== This istruction
FillList(New)
End Sub
Case 2
Public Sub Initialize (Callback As Object, EventName As String)
et.Initialize("et")
et.ShowClearButton = True
lv.Initialize("lv", False)
lv.Visible = False
lv.Color=Colors.LightGray '<==== this istruction
prefixList.Initialize
substringList.Initialize
mCallback = Callback
mEventName = EventName
End Sub