I finally fixed it. I used a TabControl to achieve this.
Here's the solution I used.
TabItem _UserPage;
private void BtnPayroll_Click(object sender, RoutedEventArgs e)
{
TxtOpenPage.Text = "Payroll management";
ChldHold.Items.Clear();
var userControls = new Payroll();
_UserPage = new TabItem { Content = userControls };
ChldHold.Items.Add(_UserPage);
ChldHold.Items.Refresh();
}