I encounter situations with scrolling involved when the combobox items are detached from the combobox.

Steps to reproduce 1):

• proceed to Datasource Setup screen
• TAB-navigate to Datasource combobox (combobox items will popup on focus)
• keep press DOWN and UP arrows
• result: combobox items are now detached horizontally from its combobox button

Steps to reproduce 2):

• proceed to Datasource Setup screen
• mouseclick Datasource combobox and select Datasource XA
• without other clicking scroll by mousewheel down
• press DOWN arrow and then UP arrow to select Datasource
• result: combobox items are now detached from its combobox button