如何使用不同的类python在一个类中的一个窗口中更新列表框

what i have is a window that opens up and it has a list box. this is created using one class. when i click the search button and results are found using a different class, i want the list box to update without having to open up another window. below is my code so far\nwhat i have is a window that opens up and it ha