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Check out SetCursor() code, it removes old cursor when setting to null.

void UI::SetCursor(Cursor* cursor)
{
    if (cursor_ == cursor)
        return;

    // Remove old cursor (if any) and set new
    if (cursor_)
    {
        rootElement_->RemoveChild(cursor_);
        cursor_.Reset();
    }
    if (cursor)
    {
        rootElement_->AddChild(cursor);
        cursor_ = cursor;

        IntVector2 pos = cursor_->GetPosition();
        const IntVector2& rootSize = rootElement_->GetSize();
        const IntVector2& rootPos = rootElement_->GetPosition();
        pos.x_ = Clamp(pos.x_, rootPos.x_, rootPos.x_ + rootSize.x_ - 1);
        pos.y_ = Clamp(pos.y_, rootPos.y_, rootPos.y_ + rootSize.y_ - 1);
        cursor_->SetPosition(pos);
    }
}

Better use nullptr.

“If you have to name the null pointer, call it nullptr; that’s what it’s called in C++11. Then, “nullptr” will be a keyword.” – Bjarne Stroustrup

It’s my favourite return value.