Webviewer go back notifier


I want with back button webviewer go back and if they can not go back come notifier.
This works as well but if i go for example from site 2 back to1 then comes the notifier. But thats not right. I must push again back and then the notifier must come. Hope anybody understand my problem.
Here are the blocks.

Any Idea how I can fix my Problem....

You might want to adjust this example to your needs

And next time before taking a screenshot first switch the language to English, so everyone is able to read your blocks...


I have make it like this but doesn´t.
Here are my blocks in English.

When scteen2 back pressed event you have used two if condition, just remove the first if condition and test.

Thanks, I have testet it but then comes this message

Argument #2 (com.sunny.CustomWebView.CustomWebView@c8a51d9) to 'com.gordonlu.webviewerprogress.WebViewProgress.ApplyProgressChangedListener(com.google.appinventor.components.runtime.AndroidViewComponent)' has wrong type (com.sunny.CustomWebView.CustomWebView) (expected: com.google.appinventor.components.runtime.AndroidViewComponent)
Note: You will not see another error reported for 5 seconds.

I have make it because in the link from Taifun you can see it.