ATL attributed programming, need help!

[xi904]

Hi, I have recently moved over atl attributed programming and created a ActiveX Control which is used in a vb 6 application, but when i call a method, like this: ++++vb code+++++ Private Sub Command1_Click() Dim a As Long a = 1 Me.Chh1.test a 'Chh1 is a atl object End Sub ++++ atl code++++ STDMETHODIMP Chh::test(LONG tt) ,vb say that variable "a" has a type mismath error. This atl project has used attributed programming in atl wizard. Then I created another atl project which didn't use attribute programming, every thing is ok. It's so strange! How can I correct this problem? Thanks, Jeff Xi.