private void btnEditLoan_Click(object sender, RoutedEventArgs e)
        {
            editLoanWindow window = new editLoanWindow();
            if (window.ShowDialog() == true)
            {
                mainWindow = (MainWindow)Window.GetWindow(this.Parent);
                // Update DataGrid
                mainWindow.RefreshDataGrid();

            }
        }
        public void btnAddGadget_Click(object sender, RoutedEventArgs e)
        {
            Gadget_hinzufügen window = new Gadget_hinzufügen();
            if (window.ShowDialog() == true)
            {
                mainWindow = (MainWindow)Window.GetWindow(this.Parent);
                // Update DataGrid
                mainWindow.RefreshDataGrid();

            }
        }
 private void filterInput_TextChanged(object sender, TextChangedEventArgs e)
 {
     mainWindow = (MainWindow)Window.GetWindow(this);
     mainWindow.filterGadgets(filterInput.Text);
 }
 private void filterInput_TextChanged(object sender, TextChangedEventArgs e)
 {
     mainWindow = (MainWindow)Window.GetWindow(this);
     mainWindow.filterLoans(filterInput.Text);
 }