Views block into panels and their arguments

Hello everyone,

I've got the following situation: I build a view, which show some node titles. In the footer of that view I added some letters (from A to Z) to filter the view. So when I click on A, only the node titles that starts with an A shows up. This is completly working when I added an views page (display) with URL to the view and test the URL.

Then when I add a block display to the view and add this block to a panel page, the argument won't work anymore. How is this possible and can I solve this problem.

Thank you.