用过Caliburn.Micro的大侠进
<Button cm:Message.Attach="[Event Click] = [Action Show(txtBlock.Text)]">

调用方法后，如果返回值是string,怎么把show方法返回的值赋给一个label

[解决办法]
<Button cm:Action.Target="{Binding ElementName=label}" Focusable="False" cm:Message.Attach="[Event Click] = [Action SelectAll]">