/// <summary>
/// Before opening the ContextMenuStrip, we manage the availability of the items.
/// </summary>
/// <param name="sender">the sender object</param>
/// <param name="e">the event data</param>
void BuildInContextMenuStrip_Opening(object sender, CancelEventArgs e)
{
_cutToolStripMenuItem.Enabled = _hexBox.CanCut();
_copyToolStripMenuItem.Enabled = _hexBox.CanCopy();
_pasteToolStripMenuItem.Enabled = _hexBox.CanPaste();
_selectAllToolStripMenuItem.Enabled = _hexBox.CanSelectAll();
}