General :: Combobox Opens A Different Form

I have a form with a combobox. From this combobox I would like to trigger the opened of a different form with the name and surname of the patients selected into the combobox.

I used this vba code

Private Sub Find_Click()
Dim stDocName As String
Dim stLinkCriteria As String
stDocName = "ID Patient"
stLinkCriteria = "[PTS]=" & Me.Identification

[Code] ....

The problem is that when the form Id patient is already opened every thing works fine but when the Id patient form is not opened it looks like if the combobox was not able to trigger the form with the name and surname of the patients!