带有Checkbox的XAML列表框，选中复选框bevor检查它

Problem:
I have a Listbox, in that Listbox are Checkboxes. On the first click the Checkbox is selected and checked. On the second click the checkbox only gets set. One can reselect a diffrent Checkbox using the arrow keys. My goal is, that the checkbox gets selected first and then checked afterwards (clicking again on it) thus removing the need for Arrow keys. I have a Listbox, in that Listbox are