private void MainTap_TabAdding(object sender, TabControlTabAddingEventArgs e)
{
var View = new AddSourcesView();
e.Item = new DXTabItem()
{
Header = "Custom Item", Content = View.Content
};
}
private void AddSourcesViewBut_ItemClick(object sender, DevExpress.Xpf.Bars.ItemClickEventArgs e)
{
var View = new AddSourcesView();
addTabItem(View, e.Item.Content.ToString());
}