Subclass TextBox (derive from it) or native handle (with NativeWindow), and then override window procedure as follows:
protected override void WndProc(ref Message m)
{
if (m.Msg == <your menu id>) { ... return; }
...
if (m.Msg == 0x0093 /*WM_UAHINITMENU*/ || m.Msg == 0x0117 /*WM_INITMENUPOPUP*/ || m.Msg == 0x0116 /*WM_INITMENU*/)
{
IntPtr shortcut = m.Msg == 0x0093 ? Marshal.ReadIntPtr(m.LParam) : m.WParam;
// add <your menu id> to shortcut
...
}
...
base.WndProc(ref m);
}
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