public void Dispose()
{
foreach (var fd in Fixtures.Select(item => item as FixtureData))
{
fd.PropertyChanged -= fd_PropertyChanged;
}
foreach (var f in Fixtures.Select(fd => fd as FixtureData))
{
f.Dispose();
}
foreach (var c in Categories.Select(cd => cd as CategoryData))
{
c.Dispose();
}
}
