custom control timing

[Dan]

i have a custom control. In the page load of the control
I call a procedure
called binddata which gets a dataset and binds to a gird.
Then in my webform
I create and instance of the control and set the ListId
and ProjectName
properties and then add the control to the page. On the
load i'm getting an
error that an instance of an object is not set....this
error is occuring
because my dataset is returning null in the binddata
method because the
values that i'm passing in _listid and _projectname are
null even though I
set these properties in the page load of the web form.
Any Ideas on what
I"m doing wrong

'--------------Control Code--------------------
Private _ListID As Integer
Private _ProjectName As String

Public WriteOnly Property SetListID()
Set(ByVal Value)
_ListID = Value
End Set
End Property

Public WriteOnly Property SetProjectName()
Set(ByVal Value)
_ProjectName = Value
End Set
End Property

Private Sub Page_Load(ByVal sender As System.Object,
ByVal e As
System.EventArgs) Handles MyBase.Load
'Put user code to initialize the page here
If Not IsPostBack Then
BindData()
End If
End Sub

private Sub BindData()
Dim UserRes As New DataSet

'Using GAP Web Service to get values from
ATG_Web_Approval database.
UserRes = GAP.SelectCustomApprovalProcessData
(_ListID, _ProjectName)
grdCustom.DataSource = UserRes
grdCustom.DataBind()
End Sub

'---------------webpage code-----------------------------
Private Sub Page_Load(ByVal sender As System.Object,
ByVal e As
System.EventArgs) Handles MyBase.Load
'Put user code to initialize the page here
Dim ctlCustAdmin As New CustomAdmin
ctlCustAdmin.SetListId = 1
ctlCustAdmin.SetProjectname = "test"
Page.Controls.Add(ctlCustAdmin)
End Sub