Hi Jan,
I have tested this issue and I was able to see the scrolling problem. I have noticed that this problem is because of grid control. You can see the same behavior in the below sample. When you double click on a cell in grid control, message box will be displayed and the panel scrolls down when pressed Ok in message box.
We have forwarded this issue to the grid team to look into it. As a workaround, you can use ScrollControlIntoView method after displaying the message box as shown below
this.xpTaskBar.ScrollControlIntoView(this.xpTaskBarBox1);
Please let me know if you have any questions. Thanks for using Syncfusion products.
Regards,
Mano
Test_03.zip