7420: YourCustomUI
7421: update visible sample

click big button to hide small button
7422: rename project

LayoutFarm.LeanBox to LayoutFarm.LeanRenderer
7427
7429: rename project

LayoutFarm.PlatformSpecific to
LayoutFarm.Composers.WinForms
7430: rename project
7433: refactor
7434:
7436: reduce public class
7438: refactor
7440: more Encapsulation
7441: update UIDragEventArgs
Merge branch 'v_merge01' into v_html_layer
7443: IEventListener

not complete!
7444
7445: UIEventName
7446: remove HtmlEventArgs
7447
7448:merge SVG to HtmlRenderer
Merge branch 'v_dom_events' into v_html_layer