ListBox does not highlight selection when changing tabs

Question

I am currently testing C # and WPF for the first time.

I have a window with two tabs, tabA and tabB . Each tab has a list box (they are almost identical), tabA has listboxA and tabB has listboxB . When an item is selected in the list, some information about the item is displayed, so I know that it is selected.

In a specific E event, I want to highlight an item in listboxA or listboxB , which is determined by the logic in my application.

Scenario A is that I am now on tabA . When E occurs, an item in listboxA . I call listboxA.Focus() and then listboxA.SelectedItem = item . It works great. item , therefore, information about the item is displayed, and the item is highlighted in the list.

Scenario B, where I have my problem, is that I am now on tabA . When E occurs, an item in listbox B . I call tabControl.SelectedItem = tabB to switch the tab, which works fine. Like in scenario A, I call listboxB.Focus() and then listboxB.SelectedItem = item . The item is selected because information about the item is displayed, but here: item The item is not highlighted in the list .

This also happens when changing from tabB to tabA . This always happens when I change the tab, but if I stay on the same tab, the highlight works fine.

Does anyone know if there is anything else I need to do to give the focus of the list focus after changing the tab other than calling Focus() ?

Answer 1

WPF has focus tricks, the list box can be focused inside its scope, but the area itself, if it cannot be focused. In addition, the list box may have focus, but it contains a separate area for its elements that need to be focused.