private void ContextMenuVisible_NoCreate()
{
if (listContextMenuStrip != null)
{
createUserCToolStripMenuItem.Enabled = false;
changePasswordPToolStripMenuItem.Enabled = true;
deleteDToolStripMenuItem.Enabled = true;
// Show context menu.
listContextMenuStrip.Show(new System.Drawing.Point(Cursor.Position.X, Cursor.Position.Y));
}
}