Problem with form.topmost

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VB

forms

.NET4

I have created an Application with should detect if a connection via VNC comes into our machines to show the Operator of those machines that it could be possible that a remote control via VNC could happen.
This Application normally stays in Tray and becomes Visible and TopMost if such a connection is established.
All works properly ...

Now my Problem :
On our machines are different applications for the machine-control (HMI). By most of them my App comes to TopMost - by some of them not. I suppose that those applications are also sending their Form to TopMost.

Is there any possiblity for my app to become Top-TopMost ? I want to have it allways on Top - independant from all what happens with possible other applications ...

What I have tried:

Severall things like repeating the TopMost-settings and Refreshing the form by the Background-Thread - in the moment I have no idea ...