VBA Code closes my separate .Net Winform App!?!?

Question

The below code is the close routine of an Access App our BA wrote. When executed it is not only closing the Access App but my C# winform app as well, on the same computer. The Access app is named DME Referral and my winform app main process runs in the Task Manager as MATRIX.exe.(Yes I am programming the MATRIX...never allow a group of Social Workers and Nurses to name your program!)

I do not do much with Access(VBA) programming so I am hoping someone here can help.

Private Sub cmdClose_Click()
On Error GoTo Err_cmdClose_Click

Call ToggleVisible

DoCmd.Quit

Exit_cmdClose_Click:
    Exit Sub

Err_cmdClose_Click:
    MsgBox Err.Description
    Resume Exit_cmdClose_Click

End Sub

Private Sub ToggleVisible()
    Me.txtLastNameCrit.Visible = False
    Me.txtFirstNameCrit.Visible = False
    Me.cmdSearch.Visible = False

    Me.cmbCoor.Visible = False
    Me.cmdSearchByCoor.Visible = False

    Me.txtStartDate.Visible = False
    Me.txtEndDate.Visible = False
    Me.cmdDMEReport1.Visible = False       
End Sub

Answer 1

DoCmd.Quit should be just closing the MS Access portion; it's pretty standard.

I'm willing to be that one of two things are happening.
1) Focus has switched over to the C# winform app, and it's catching a signal to close. In this case, we can explicitly set the focus back to the MS Access form. You can do that with Me.SetFocus.
Or
2) The C# winform app. is being launched from withing MS Access; and when the parent application is closed, the child is as well. In this case we may have to change the way the C# winform app. is launched. Does it close down as well when you manually close MS Access (click the 'X' on the top right corner)?