(Resolved) Problem with single instance application

I have a application set as a single instance and have set the event handler like this:

vb Code:

Namespace My
    Partial Friend Class MyApplication
        Private Sub MyApplication_StartupNextInstance( _
            ByVal sender As Object, _
            ByVal e As Microsoft.VisualBasic.ApplicationServices. _
            StartupNextInstanceEventArgs) Handles Me.StartupNextInstance
 
            MessageBox.Show("Application is already open", _
                "Error Opening Form", MessageBoxButtons.OK)
            e.BringToForeground = True
 
        End Sub
    End Class
End Namespace

Everything seems to work ok as long is my applications isn't hidden (I hide the app to an icon in the system tray). When it is hidden the application is brought to the foreground but it doesn't show up on the screen and only shows as an application in the toolbar. Clicking on it doesn't do any thing to show it either. Is there something else I need to do to make this work correctly?

It sounds like your app is going from hidden to visible but minimized. If you click on the app in the toolbar, does it show up, or is it utterly unattainable?

Also, when it comes back from being hidden, is it just sitting there, or is it running some code that would block paint messages from reaching the main window?

I did get it to open once by right clicking it on the tool bar and maxmizing it but have not been able to do that again. It just gives me the move and close and size options (maximize is grayed out) when I right click on it.

I did just disable all the code the runs when the form is maximized and got the same results so the only thing happening is the unhiding of the form:

vb Code:

#Region "Timer & Notifier"
    Private Sub notCSA_BalloonTipClicked( _
        ByVal sender As Object, _
        ByVal e As System.EventArgs) Handles notCSA.BalloonTipClicked
 
        'btRefresh.PerformClick()
 
        Me.Visible = True
        If Me.WindowState = FormWindowState.Minimized Then
            Me.WindowState = FormWindowState.Normal
        End If
 
        notCSA.Visible = False
 
    End Sub
    Private Sub notCSA_MouseDown( _
        ByVal sender As Object, _
        ByVal e As System.Windows.Forms.MouseEventArgs) _
        Handles notCSA.MouseDown
 
        If e.Button = Windows.Forms.MouseButtons.Left Then
            Me.Visible = True
            If Me.WindowState = FormWindowState.Minimized Then
                Me.WindowState = FormWindowState.Normal
            End If
 
            notCSA.Visible = False
 
        End If
    End Sub

Try putting this in your StartupNextInstance event handler:

vb.net Code:

Me.MainForm.Show()

Thanks . That seemed to do the trick.