private void Deselect(object oldSelectedElement)
{
var container = GetContainerFromItem(this, oldSelectedElement);
if (container != null)
{
container.IsSelected = false;
if (Equals(container, _lastSelectedItem))
{
_lastSelectedItem = null;
}
SelectedTreeViewItems.Remove(container);
}
}
private void HandleControlKeySelection(TreeViewItem newSelected)
{
if (SelectedTreeViewItems.Contains(newSelected))
{
newSelected.IsSelected = false;
SelectedTreeViewItems.Remove(newSelected);
if (_lastSelectedItem != null)
{
_lastSelectedItem.IsSelected = true;
}
_lastSelectedItem = null;
}
else
{
if (_lastSelectedItem != null)
{
_lastSelectedItem.IsSelected = true;
}
SelectedTreeViewItems.Add(newSelected);
_lastSelectedItem = newSelected;
}
}