private void ResetOKBtnEnable()
{
bool haveCheckeditems = false;
foreach (TreeNode node in m_nodes)
{
if (node.Checked)
{
haveCheckeditems = true;
break;
}
}
TreeNode selNode = m_tvMasterList.SelectedNode;
m_btnOK.Enabled = haveCheckeditems
|| (selNode != null
&& !(selNode.Tag as MasterCategory).InDatabase);
}