Screensaver does not disappear when EVENT_TAG_CHANGE is used

Hi,
This problems happens on Touch PC with a running screensaver.
When we use the event EVENT_TAG_CHANGE to show a popup when something is happening on the KNX-bus, the popup is showed behind the screensaver.
So, when the screensaver is running, the popup is not displayed. You have to tap on the Touchscreen to remove the screensaver, and then the popup is showed.
What we want: when a screensaver is running, and a popup has to be displayed, the screensaver must cancelled by the iRidium client on the Windows PC.
Thanks
Theo