private void ListAdd_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
if (listAdd.SelectedItem == null)
{
return;
}
inSelectionChanged = true;
ListBoxItem item = (ListBoxItem)listAdd.SelectedItem;
IBlock block = BlockManager.NewBlock((IBlock)item.Tag);
AddBlock(block);
AddTimer.Start();
tbLine.Text = string.Format("{0} lines", listCode.Items.Count);
Edited = true;
btnDelete.IsEnabled = btnCut.IsEnabled = btnCopy.IsEnabled = btnGroup.IsEnabled = btnUngroup.IsEnabled = false;
inSelectionChanged = false;
}