private void DataGridView_MouseUp(object sender, MouseEventArgs e)
{
var hitTestInfo = _dataGridView.HitTest(e.X, e.Y);
/*Ha fejlcécre kattint, akkor egy másik kontext menü jelenik meg.*/
if (hitTestInfo.Type == DataGridViewHitTestType.ColumnHeader)
{
if (e.Button == System.Windows.Forms.MouseButtons.Right)
{
CreateColumnHeaderContextMenuStrip(hitTestInfo.ColumnIndex).Show(_dataGridView, new System.Drawing.Point(e.X, e.Y));
}
}
}