C#

Malcolm Smart wrote:

Me too! I wished they wouldn't do that...

Pete O`Hanlon wrote:

Now, if the poster goes away and comes back with improved coding skills then I would be delighted.

[Designer(typeof(MyTabControlDesigner))]
public class MyTabControl : UserControl
{
	protected override void OnMouseDown(MouseEventArgs e)
	{
		if ((tabPageNext = GetHitTest(e.Location)) != null)
		{
			tabPageLast = TabPageFocused;
			if (DesignMode)
			{
				ISelectionService s = (ISelectionService)GetService(typeof(ISelectionService));
				ArrayList a = new ArrayList();

				a.Add(tabPageNext);
				s.SetSelectedComponents(a);
			}
			else
				OnSelectionChanged();
		}
		base.OnMouseDown(e);
	}

	internal void OnSelectionChanged()
	{
		// update focused page
		TabPageFocused = tabPageNext;
	}

	// return true once a selection is freshly made
	internal bool SelectionIsFresh()
	{
		if (TabPageFocused != tabPageLast)
			return false;
		tabPageLast = new TabPageEx();
		
		return true;
	}

internal class MyTabControlDesigner : ControlDesigner
{
	void OnSelectionChanged(object sender, System.EventArgs e)
	{
		IDesignerHost dh = (IDesignerHost)GetService(typeof(IDesignerHost));
		IComponentChangeService cs = (IComponentChangeService)GetService(typeof(IComponentChangeService));
		DesignerTransaction dt;
		
		// validate selection
		if (!tabControl.SelectionIsFresh())
			return;
		// forward a selection event to the control
		dt = dh.CreateTransaction("Select MyTabPage");
		cs.OnComponentChanging(tabControl, null);
		//
		tabControl.OnSelectionChanged(); // updates to the control happens here, dt record it for IDE Undo
		//
		cs.OnComponentChanged(tabControl, null, null, null);
		dt.Commit();
	}