private void showAddFile()
{
var f = new frmFiles();
f.GroupID = ID;
f.ShowInGroupOnly = false;
var result = MainFormPopupForm(f, this, false);
if (result == DialogResult.OK)
{
foreach (var id in f.SelectedIDs)
{
AdminProxy.AddFileToGroup(ID, id);
}
RefreshData();
}
}