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NavigationPanel "without header" transition


I need to separate FluidHeader from the NavigationPanel and place some tab buttons between, I copy-pasted sources of NavigationPanel class and removed header display, use external header control with it's own paining. (NavigationPanelWithoutHeader : ControlContainer)
Everything looks good for SelectedIndex switch, but transition content falls down in case of navigation.Switch, it falls for ~ 2*PageControl.Top. And works well only with Top == 0.
I found one possible fix in TransitionPanel.cs, but it fills black all top non-transition content), and I need to have any top controls untouchable while transition.
int transTop = 0;
private void OnBeginTransition(int index)
        transTop = this.Parent.Top;
        this.Top = this.Parent.Top;
        this.Parent.Top = 0;
        if (BeginTransition != null)
            beginTransitionEventArgs.NewValue = index;
            BeginTransition(this, beginTransitionEventArgs);
protected virtual void OnTransitionCompleted(Animation a)
        this.Parent.Top = transTop;
        this.Top = 0;
        if (TransitionCompleted != null)
            TransitionCompleted(this, a.eventArgs);