Add or document/demo ability to hide/show ClickMenuItems

[paulpv]

I want to make a menu that has state based icons.
I could make several menu trees, but I'd rather make as few as possible and be able to dynamically hide/show specific ClickMenuItems.
If this is possible, then please document/demo how to do this.
If this is not possible then please consider implementing this.

NOTE: I also want to be able to dynamically change the tooltip and icon, but this also appears to not be implemented supported. Perhaps the implementation to make hide/show possible could also take dynamic text/icon in to account too.

[malik-at-work]

This is a great idea! I can see how this would be useful. The code isn't designed to do this right now, it builds ClickMenuItems from an AssetTree and it's assumed that the AssetTree has been serialized.