Open user control from another user control in WPF

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WPF

Hi

i have a main window and i use user control such as a form that open inside window,

i have close button inside user control, how can i remove or clear opened user control and open another user control?

What I have tried:

private void btnCancel_Click(object sender, RoutedEventArgs e)
{

((Panel)this.Parent).Children.Remove(this); // remove opened user control

winMain w = new winMain();
OpenUserControls.OpenUCMain(w.MainContent, new ucMain()); // dont open another user control
}

// my method for open user control (ucMain)

public static void OpenUCMain(Grid grd, UserControl uc)
{
if (grd.Children.Count == 0)
{
grd.Children.Add(uc);
}
}