TabControl - Lose the handlig to item content

Hi, 

I'm still a novice at working with the TabControl. 

I am using an Access 2013 database. On a form I have placed a TabControl. In Form_Load I create two TabItems. TabItem1 gets the handle to form 2 and TabItem2 gets the handle to form third. Both I have previously opened in the background. 

Now if I change between the two TabItems, I can select or activate only the controls on the form 3. The controls on form 2 I see, but can not select them. 

What am I doing wrong? 

Here is the source of Form_Load:

Private Sub Form_Load()

   

  On Error Resume Next

   

  Dim xTab As XtremeSuiteControls.TabControl

  Set xTab = Me.tabMain.Object

  xTab.ShowCloseItemButton = xtpTabItemButtonSelected

  DoCmd.OpenForm "Form2", acNormal, , , , acNormal

  DoCmd.OpenForm "Form3", acNormal, , , , acNormal

  xTab.InsertItem xTab.ItemCount, "Form2", Forms("Form2").hWnd, 0

  xTab.Item(xTab.ItemCount - 1).Closable = True

  xTab.InsertItem xTab.ItemCount, "Form3", Forms("Form3").hWnd, 0

  xTab.Item(xTab.ItemCount - 1).Closable = True

    

End Sub