How to add WPF page to tabcontrol?

Question

I have this main wpf window

and this WPF page

Answer 1

If you want to add a new Page, as opposed to a UserControl, you can create a new Frame object and place the page in there.

    if (ISFirstRender)
    {
        TabItem tabitem = new TabItem();
        tabitem.Header = "Tab 3";
        Frame tabFrame = new Frame();
        Page1 page1 = new Page1();
        tabFrame.Content = page1;
        tabitem.Content = tabFrame;
        pan1.Items.Add(tabitem);

        ISFirstRender = false;
    }