internal void deleteGroup(Group group)
{
groups.Remove(group);
group.onDelete();
group = null;
}
/// <summary>
/// Creates a new hierarchical group.
/// </summary>
/// <param name="mainObj">The group master item; the subordinated items will follow the
/// master one when it is moved around.</param>
/// <returns>A new Group instance.</returns>
public Group CreateGroup(ChartObject mainObj)
{
if (mainObj == null) return null;
Group group = new Group(this);
if (group.setMainObject(mainObj))
{
AddGroupCmd cmd= new AddGroupCmd(mainObj, group);
undoManager.executeCommand(cmd);
return group;
}
else
{
group.onDelete();
group = null;
return null;
}
}