How do you draw a border around a DataGridView cell while it's being edited?

Question

I would like to draw a red border around a DataGridView cell while it\'s being edited.

I\'ve managed to draw a red border around the selected cell while

Answer 1

It seems like the EditingControl is hosted in a parent Panel, and if you set the Opaque style of that panel to true, then the border will be painted.

E.g.

void dataGridView1_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e) {
    var c = e.Control;
    var p = c.Parent;
    SetStyles(p, ControlStyles.Opaque, true);
}

private static void SetStyles(Control c, ControlStyles styles, bool value) {
    MethodInfo mi = typeof(Control).GetMethod("SetStyle", BindingFlags.NonPublic | BindingFlags.Instance);
    mi.Invoke(c, new Object[] { styles, value });
}