DropDownButton has a CheckListBox as its item. Now, the DropDown popup gets closed on clicking the checklistbox item.By default, we have ShowDropDownOnClick property which helps to stay the popup always open on clicking the DropDown menuitem. It works for DropDownMenuItem only and not for other kind of items which is added as a child of DropDownButtonAdv.
1.Start the application
2.Open the DropDown of DropDownButtonAdv
3.Click the item and no you can see the DropDown get closed on setting the ShowDropDownOnClick property.
Expected result: The dropdown should stay open , even on clicking the checklistbox item.