Hello,

Thank you for posting in our community.

In order to navigate to the selected item you have do it on the client-side with JavaScript inside the WebExplorarTab's Initialize event handler:

......
<ig:WebExplorerBar ID="web" runat="server" Width="300px">
<ClientEvents Initialize="selectionNavigate" />
<Groups>
......

function selectionNavigate(sender, eventArgs) {
	var selectedItem = sender.get_selectedItem();
	if (selectedItem) document.getElementById("frame").contentDocument.location.href = selectedItem.get_anchorElement().getAttribute('href');
}

If there is a previous selected item, it has to be deselected and additionally a CSS class has to be added which will clear the active state of that item:

Dim prevSelectedItem = WebExplorerBar.SelectedItem

If prevSelectedItem IsNot Nothing Then
	prevSelectedItem.ActiveCssClass = "none"
	prevSelectedItem.Selected = False
End If

WebExplorerBar.Groups(1).Items.Last().Selected = True

I have attached a sample for your reference. Let me know if that solves your issue.