void EnableCancel()
{
if (!btnCancel.Enabled)
{
SystemMenu.EnableCloseButton(this);
}
btnCancel.Enabled = true;
}
void DisableCancel()
{
if (btnCancel.Enabled)
{
SystemMenu.DisableCloseButton(this);
}
btnCancel.Enabled = false;
}
protected override void OnSizeChanged(EventArgs e)
{
// handle the effect of minimize/restore on
// disabling the "close" button & menu item
if (!btnCancel.Enabled)
{
SystemMenu.DisableCloseButton(this);
}
base.OnSizeChanged(e);
}