Strange behaviour from modifed slider

Dear all,

I have modified the base GH_NumberSlider by hiding the original TickCount and TickValue methods in the code attached. (TickValue TickCount.cs)

I, then iterate though each value with a recursive function using the code:

slider.TickValue++ 

and after each iteration I expire the solution using:

Document.NewSolution(false);
Rhino.RhinoDoc.ActiveDoc.Views.Redraw();

Causing the slider value to update.

This works, however after running the final iteration the wires are all orange and the data doesn't appear in the panel - see End of Solution.jpg.

Only when I interact with the canvas for example by dropping a component on the canvas do the wires turn green and all the data appears in the panels - ComponentOnCanvas.jpg

Why is this the case? I am I forgetting to expire something? I can't work out what is causing this behavior! 

Many thanks!