Event to use for Creation of a Check box on Warehouse master Form

Question

Hi experts
I have created one check box on Warehouse Master form in AfterMENUClick Event. It works fine if I open the form on Menuclick . But If I open the Warehouse master form by Link button from any document, it does not show the check box. I also want to deactive the checkbox if once it checked. So, I do some coding in Data_Load event. It also works fine If I open the form by Menu click. But if I open the form by Link button it gives error " Invalid Item Id ". 
So I want to know which event I should use to create the check box and which Event I Should use to Deactive the Check box

Answer 1

Thanks Nagy for quick reply
I use the following code for creation of check box
<B1Listener(BoEventTypes.et_FORM_LOAD, False, New String() {"62"})> _
        Public Overridable Sub OnAfterFormLoad(ByVal pVal As ItemEvent)
            Dim ActionSuccess As Boolean = pVal.ActionSuccess
            Dim form As Form = B1Connections.theAppl.Forms.Item(pVal.FormUID)
            'ADD YOUR ACTION CODE HERE ...
            Dim oForm As Form
            Dim oMatrix As Matrix
            Dim oItem As Item
            Dim sysItem As Item
            Dim BinCheck As CheckBox
            Dim BinLabel As StaticText
            Dim cmbBinCode As ComboBox
            oForm = B1Connections.theAppl.Forms.ActiveForm
            oForm.PaneLevel = 1
            sysItem = oForm.Items.Item("2000002010") 'Excisable check box
            oItem = oForm.Items.Add("BinChk", BoFormItemTypes.it_CHECK_BOX)
            oItem.Left = sysItem.Left
            oItem.Top = sysItem.Top + 20
            BinCheck = oItem.Specific
            BinCheck.Caption = "Bin Enabled"
            BinCheck.DataBind.SetBound(True, "OWHS", "U_BinEnabled")
        End Sub
It gives error on sysItem = oForm.Items.Item("2000002010") line Invalid Item Id
Plz check and tell the problem
Regards
Gorge