اینطوری شد
foreach (Control item in radPageView1.Controls)
{
var page = item as Telerik.WinControls.UI.RadPageViewPage;
if (page == null) continue;
foreach (Control pgw in page.Controls)
{
var box = pgw as Telerik.WinControls.UI.RadGroupBox;
if (box == null) continue;
foreach (Control itemCheck in box.Controls)
{
var checkBox = itemCheck as Telerik.WinControls.UI.RadCheckBox;
if (checkBox == null) continue;
if (linesCH.Contains(checkBox.Tag.ToString()))
{
checkBox.Checked = true;
}
else
{
checkBox.Checked = false;
}
}
}
}





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