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1. No need to define view model id, the view model id will be 'vm' by default.

Old	New
viewModel="@id('vm') @init('...')"	viewModel="@('...')"

2. No need to define @Command in ViewModel

3. Instead of @BindingParam, use the order of the parameters

Old	New
onClick="@command('doClick', aa=123, ss=1, bb='asssas,sa2')"	onClick="@('doClick', 123, 1, 'asssas,sa2')"

4. Provide shortcut for MVVM expression in ZUL

Old	New
@init(vm.aaa)	@(vm.aaa)
@command('cmd')	@('cmd') //auto bind in event (ex. onClick, onXxx...)

relates to

ZK-4688 A null parameter passed to a global command causes ClassCastException

ZK-4723 simplified MVVM binding cause non-command method with same name in different VM to trigger on @global-command

ZK-4726 Cannot pass a parameter without @BindingParam

ZK-5018 Enhance simplified MVVM syntax