private void rad_MultiSelect_CheckedChanged_1(object sender, EventArgs e)
{
if (!pnl_LoadQuestion.Controls.Contains(Question_MultiSelect_1.instance))
{
pnl_LoadQuestion.Controls.Add(Question_MultiSelect_1.instance);
//Question_MultiSelect_1.instance.Dock = DockStyle.Fill;
Question_MultiSelect_1.instance.BringToFront();
}
else
Question_MultiSelect_1.instance.BringToFront();
}