Error Unable to cast object~

Please let me know what is problem:

Unable to cast object of type 'Dbasic.Crunner' to type 'System.Windows.forms.control'

I am testing FormLib and AddContextMenu.


== Source Code ===
Sub Globals


End Sub


Sub App_Start
Form1.Show
FormLib1.New1("Form1",B4PObject(1))
Context1.New1
Context1.AddItem("Yes")
Context1.AddItem("No")
Context1.AddItem("-") 'Adds a separator
Context1.AddItem("Maybe")
FormLib1.AddContextMenu("TextBox1",Context1.Value)
End Sub


Sub Context1_Click
Select Context1.SelectedText
Case "Yes"
'Do something
Case "No"
'Do something
Case "Maybe"
'Do something
End Select
End Sub

You probably don't have a "Textbox1" control on your Form1.

Thank you so much~

Thank you so much~