在炖煮四物鸭汤的时候，所放入的四物指的是地黄、白芍、当归和川穹等药材，主要将其放在小沙袋中，制作成药包，在炖煮的时候放进去，先用大火烧开再用小火慢炖，经常食用可有调经补血的功效。炖鸭汤放四物的窍门
I have a combobox in a view that receives information about application state changes, and then is supposed to show or hide it\'s children based on the whole application state.
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