Associate toolbar UI instances

[Garry Yao]

Currently it's been difficult to find the relationship of UI instances ( e.g. buttons, combos etc. ), and it's related toolbar instances. Adding more cross-reference among them could benefit the plugin authoring which will manipulate the toolbar.

[Garry Yao]

With the patch, it's able to play the toolbar in the following way:

var ui = editor.ui,
	uiItems = ui._.items,
	// Find the format combo UI instances with registered name.
	combo = uiItems[ 'Format' ],
	// Retrieve the toolbar item which associate with format combo.
	comboToolbarItem = uiItems.toolbarItem;

[Piotrek Koszuliński]

Closing because idea expired and there's no real case mentioned.