I have a WinForm with a treeview control and 5 panel controls. All panels are non-visible at runtime. Based on the treeview node selected, the associated panel becomes visible. On one of the panels, there are several textbox controls and maskedtextbox controls. Each textbox control has a LostFocus event. When the user navigates away from Textbox1, the LostFocus is fired, as I would expect. But when the user navigates away from Textbox2, the LostFocus does not fire; if you click back on Textbox2, then the LostFocus fires. This happens with all the textbox controls, except Textbox1. I don't know what to make of this.
For Textbox2, if I switch to the Leave or Validating events, I have the same problem. Any ideas out there?