Question

The mousedown event for the tabcontrol only captures the mouse click made on the tabs on top of the Tabcontrol, not what’s added inside the control (The white space).

Is there a way to capture the event of mousedown that’s made inside the tabcontrol?

Answer 1

The tabpages inside the tabcontrol are controls on themselves and on which you can catch mouse events.
If added from designer, you can add them to a specific tabpage directly

    private void tabPage1_Click(object sender, EventArgs e)
    {

    }

or a more generic approach, by adding an event to all existing tabpages (if the pages are dynamic, you might want to catch tabadded/removed events too)

        foreach(TabPage tp in tabControl1.TabPages)
            tp.Click += new EventHandler(YourClickEventHandler);